Canine Diseases

Canine Adenovirus

There are two types of Adenovirus. Type I Adenovirus causes canine hepatitis and is a highly contagious viral disease transmitted only to dogs. Ingestion of saliva, urine or feces of infected dogs is the main route by which the infection is spread. Recovered dogs shed the virus in their urine for over 6 months. Symptoms include; fever, diarrhea and eye, liver and kidney damage and death. Type II is a highly infectious disease of the respiratory tract and can be a complicating factor in kennel cough.

The best way to prevent this is by vaccination.

Canine Bordetella (Kennel Cough)

Frequently involved in kennel cough complex, this bacterial infection may occur simultaneously with distemper, adenovirus type 2 infection, parainfluenza and other respiratory infections. This is a bacteria that causes respiratory illnesses. Signs are a dry hacking cough. Usually goes away by itself. Incubation period is 2-14 days. May be treated with cough suppressants to provide comfort during natural recovery. Two other options for Kennel cough are injectable and intranasal vaccination. But be alert to severe cases of infectious tracheobronchitis which frequently progress to pneumonia.

The best way to prevent this is by vaccination.

Canine Coronavirus

Coronavirus is highly contagious and can weaken dogs by causing severe vomiting and diarrhea. The diarrhea may appear yellow or mixed with blood. The diarrhea and vomiting usually causes the dog to lose weight. The disease is sometimes confused with parvovirus. The two diseases may occur simultaneously in which case symptoms are more severe. Corona is most serious in puppies but may affect dogs of any age. The mode of infection is through the infected feces.

The best way to prevent this is by vaccination.

Canine Distemper

This highly contagious viral disease is found wherever dogs are found. It affects the respiratory and nervous system and is often fatal. It is transmitted via direct or indirect nose and eye discharge from infected dogs. Primarily seen in puppies 3-6 months old, it is the primary killer of puppies along with parvo. Early signs of distemper resemble a severe cold and symptoms may include squinting, eye congestion and discharge, vomiting, and diarrhea. In more advanced cases, it may cause convulsions and death. Distemper is highly contagious. Primary vaccination should begin at 6-12 weeks of age since dogs often contract the disease at an early age. This disease mostly kills young dogs -- adult dogs often survive it.

The best way to prevent this is by vaccination.

Canine Leptospirosis

Leptospirosis is a bacterial disease carried by many wild animals. A dog can contract the disease from infected animals or (more likely) by drinking contaminated water which a rat has urinated into. Yearly vaccination can reduce your dog's chance of acquiring the disease, but vaccines are not available for every type of lepto, and there are more adverse reactions from lepto vaccines than most other vaccines. The symptoms of Leptospirosis are, fever, tiredness, vomiting, gastrointestinal alterations, renal problems etc. It is possible for humans to contract this disease.

The best way to prevent this is by vaccination. However, because of the possibility of adverse reactions in puppies, it is my recommendation that the dog be a year old before receiving this vaccination. Please consult with your vet to decide what is the right choice for you and your dog.

Borreliosis (Lyme Disease)

Borreliosis, or Lyme Disease, is an infection caused by a bacteria which is spread primarily by the painless bite of an infected deer tick. Symptoms of Borreliosis in the dog include fever, lethargy, muscle stiffness, swollen joints, depression and lack of appetite. In more severe cases, lameness occurs as a result of severe musculoskeletal or arthritic type joint pain.

The best way to prevent this is by reducing your dog's exposure to ticks.

Canine Parainfluenza

Parainfluenza is a highly infectious disease of the respiratory tract. It is transmitted by air, and readily cause localized infections. The disease itself is mild, but secondary bacterial infections cause a more severe manifestation. Coughing of various intensity and frequency, along with fever and runny nose are the common symptoms. This viral respiratory disease is often partly responsible for "kennel cough" in dogs. Infection can be severe in young puppies.

The best way to prevent this is vaccination.

Canine Parvovirus

This highly contagious viral disease usually causes severe diarrhea and vomiting in dogs of all ages but is especially deadly in puppies where death often occurs 48-72 hours after onset of symptoms. This virus can withstand exposure to most disinfectants and most temperature changes. If you have had parvo in your kennel, hit it with pure bleach and really work it into the crevices. Dose the kennel multiple times and let the disinfectant stand and pool on surfaces. Parvo can persist in an area for months. Parvovirus is a virus that appears suddenly with bloody diarrhea and vomiting caused by serious degenerative enteritis. The symptoms are fever, drowsiness, extreme depression, anorexia, bloody watery stools or mucous with a very intense odor.

The best way to prevent this is vaccination.

Canine Giardiasis

Giardia is a parasite that lives in many different and often unexpected water sources. It causes giardiasis, which is the most frequently occuring protozoal water-borne illness in North America. Your pet can contract the disease simply by drinking contaminated water. Symptoms of Giardia include diarrhea, weight loss, fever, dehydration, nausea, abdominal pain and poor weight gain. It is possible for humans to contract this as well.

The best way to prevent this is by eliminating your dogs exposure to untreated water supplies such as creeks, ponds, puddles, etc.

Coccidiosis

Coccidiosis is a parasitic disease of the intestinal tract caused by microscopic organisms called coccidia. The disease spreads from one animal to another by contact with infected feces. It is most severe in young or weak animals and often causes bloody diarrhea. The primary sign of an animal suffering with coccidiosis is diarrhea. The diarrhea may be mild to severe depending on the level of infection. Blood and mucous may be present, especially in advanced cases. Severely affected animals may also vomit, lose their appetite, become dehydrated, and in some instances, die from the disease. Albon as well as several other drugs have been successful in the treatment and prevention of coccidia. The spread of coccidia occurs by otherwise healthy puppies coming into contact with contaminated feces.

The best way to prevent this is by practicing strict sanitation. Removing fecal matter promptly, and making sure that housing needs are such that food and water cannot become contaminated with feces. Clean water should be provided at all times. Most disinfectants do not work well against coccidia; incineration of the feces, and steam cleaning, immersion in boiling water or a 10% ammonia solution are the best methods to kill coccidia. Coccidia can withstand freezing temperatures.

Rabies

Of all animal diseases, rabies is probably the most feared. Rabies is an acute viral encephalomyelitis (affecting the brain). Once the clinical signs appear, the disease is almost invariably fatal. Transmission is by the introduction of the virus laden saliva into the tissues. The incubation period maybe prolonged and variable. After entering the muscle cells, the virus replicates itself, and travels via the peripheral nerves to the spinal cord, and ascends to the brain. From here it once again travels through the peripheral nerves to the salivary glands. Rabid animals of all species exhibit typical signs of CNS disturbance. The most reliable signs are unexplained behavioral changes and paralysis. Clinical disease has 3 forms. 1. Prodromal State: Lasts for 1-3 days. Typical signs are vague CNS comesymptoms progressing rapidly. 2. Furious form: This is classical Mad Dog Syndrome. The animal becomes irrational and with the slightest provocation, becomes vicious and aggressive. The posture gives an appearance of alertness and anxiety with dilated pupils. Such dogs when allowed to roam, frequently attack people, or any moving object. They chew the wire and frames of their cages. Muscular incoordination and seizures develop. Death is the result of progressive paralysis. 3. Paralytic form: This presents with paralysis of the throat and muscles of the jaw, with profuse salivation and inability to swallow. The lower jaw drops down. The paralysis progresses to all parts of the body and coma and death follow within hours. Most pets are exposed to rabies by bites from wild animals, particularly skunks, raccoons, bats and foxes. The disease can be transmitted to humans through the bite of an infected pet.

The best way to prevent this is by vaccination.

Ear Mites

Ear mites are tiny infectious organisms resembling microscopic ticks. The mite can just barely be seen as a small white dot with the naked eye, but it usually must be detected by examination of a sample of ear wax under a microscope. Infection usually produces a characteristic dry black ear discharge commonly said to resemble coffee grounds. Because of the classical appearance of this discharge, infection is often diagnosed based on the presence of such discharge though without visual confirmation of the mite under the microscope, it is possible to be led astray. The discharge is composed of ear wax, blood, inflammatory biochemicals, and ear mites themselves.

Ear mites do not burrow as some mites do but live within the ear canal.

Ear mites can cause intense irritation of the ear canal. Signs of ear mite infestation include excessive head shaking and scratching of the ears. Your pet may scratch to the point that it creates bleeding sores around its ears. A brown or black ear discharge is common. If left untreated, bacterial infections from scratching may lead to abscesses or hematomas. Severe cases of untreated canine ear mites can also lead to permanent damage to the ear canal and hearing loss or deafness.

You can prevent ear mites by drying your pet's ears after bathing, checking his ears for foreign matter and promptly visiting the veterinarian at the first sign of trouble.

Seizures and Epilepsy

What is a seizure?

Seizures also known as a convulsion or fit are one of the most frequently seen neurological problems in dogs. A dog having a seizure may have all or any combination of the following:

  1. Loss of derangement of consciousness.
     

  2. Contractions of all the muscles in the body.
     

  3. Changes in mental awareness from nonresponsivesness to hallucinations.
     

  4. Involuntary urination, defecation or salivation.
     

  5. Behavioral changes, including non-recognition of owner, viciousness, pacing, and running in circles.

Three phases of a seizure...

  1. The pre-ictal phase, or aura, is a period of altered behavior in which the dog may hide, appear nervous, or seek out his/her owner. He/she may be restless, nervous, whining, shaking, or salivating. This stage may last a few seconds to a few hours.
     

  2. The ictal phase is the seizure itself and last from a few seconds to five minutes. During this phase, all of the muscles of the body contract strongly. The dog usually falls on its side and seems paralyzed while shaking. The head will be drawn backward. Urination, defecation, and salivation often occur. If it is not over within five minutes, the dog is said to be in status epilepticus (prolonged seizure). When this occurs, the dog's life is endangered. Unless intravenous medication is given promptly, the dog may die. You should contact your veterinarian immediately!
     

  3. During the pos-tictal phase, there is confusion, disorientation, salivation, pacing, restlessness, and/or temporary blindness. there is no direct correlation between the severity of the seizure and the duration of the post-ictal phase.

The dog during the seizure...

Despite the dramatic signs of a seizure, the dog feels no pain, only bewilderment. As long as the dog is on the floor or ground, there is little chance of harm occurring.

Types and cause of seizures...

  1. Primary epilepsy or idiopathic epilepsy - This type of seizure occurs for no apparent reason and no reason being found despite careful examination. Most of the time the onset of seizures in dogs with primary epilepsy is between one and five years of age and there usually is a fairly long interval between the first seizure and subsequent seizures when they occur.
     

  2. Secondary seizure or reactive seizures occur as a reaction to medication, allergies, toxins, other diseases, fevers and anything else that disturbs brain function. This type of seizure can occur at any age.
     

  3. Anatomical or structural disease in the brain is another cause of seizures. This can be from a brain tumor, inadequate drainage of fluid in the skull (hydrocephalus), bleeding in the brain, circulatory problems in the brain, and other structural or anatomical problems. Unfortunately, dogs over five years of age with seizures that occur without a prior history of seizure activity and that recur quickly, the most likely diagnosis is a brain tumor.
    MRI and CT scans are very helpful in diagnosing brain tumors. Due to the cost of these procedures it may be a good idea to think about the next step for a brain tumor, which would be radiation therapy or surgery, before spending the money for the scans. If you know that these options are not available or suitable, then it may not be worth making a definite diagnosis. A really careful neurologic exam may reveal clues about the possibility of a seizure but most of the time there aren't discernible
    neurologic signs in dogs with brain tumors, at least early on.
     

  4. The last cause of "seizures" are things that look a lot like seizures, but really aren't. The most common problems that are sometimes mistaken for seizures are fainting due to heart disease and low blood sugar (hypoglycemia), which is most commonly associated with overproduction of insulin due to insulinomas (a tumor of the pancreas).

Finding out why your dog has seizures...

Your veterinarian will most likely begin by taking a thorough history concentrating on possible exposure to poisonous or hallucinogenic substances or history of head trauma. A physical exam, basic blood test, and an EKG will be performed. These tests will be used to rule out disorders of the liver, kidneys, heart, electrolytes, and blood sugar levels. A heartworm test will be performed if your dog is not taking heartworm preventative on a regular basis.

If all of the above tests come back normal, and there is no exposure to poison or recent trauma, further diagnostics may be performed depending on the severity and frequency of the seizures. Other tests include, a spinal fluid tap and fluid analysis, specialized imaging of the head with a CAT scan or MRI may be performed depending on availability.

5 Common Worms

1. Hookworms

Hookworms that infect canines belong to the Ancylostomatidae family of parasitic nematodes which get their name from the hook-like mouth parts they use to attach to the intestinal walls of their hosts. Despite their small size, hookworms can siphon a large volume of blood from their hosts and cause serious illness, especially in young dogs. Thankfully however modern medicine has provided us with a plethora of de-worming medications, so treatment and prevention of hookworms is relatively simple and highly effective. Hookworms when present are found in the small intestine of their host.

Clinical symptoms that may suggest your dogs is suffering from an infestation of hookworms include generalized weakness and pale gums (results of severe anemia), a dull coat, and significant weight loss. A number of very effective, very safe de-worming agents are available through your veterinarian. In fact, most puppies are de-wormed as a precaution as early as 2 or 3 weeks of age.

2. Tapeworms

The worms attach themselves to the inner walls of the intestine, but do not suck blood in the same volume as do hookworms. As the worms mature they shed mobile segments that are then passed in the feces and may often be seen around the anus, on the dog’s coat, or in bedding. Though it is not among the most harmful of parasites, it is still important to minimize tapeworm infections in your companion animals, as they may be passed to other mammals and occasionally humans.

Once outside the body, these segments dry out and release their egg cargo. These eggs may then be eaten by flea larvae present on the dog or in the carpet or bedding of the dog’s environment. As a dog chews or licks in order to alleviate the itching caused by fleas, he often will swallow fleas themselves. If the flea has at any point consumed tapeworm eggs, these eggs will be released into the digestive system during the digestive process. As this happens, the eggs hatch and the new worms attach themselves to the intestinal lining to start the cycle anew.

The most common cause for suspicion of tapeworm infection is the sighting of small segments on the dog’s coat, around the anus, in his bedding, or on carpet frequented by the dog. These segments resemble grains of rice when new but change color slightly and become golden as they dry. Segments may cause irritation and cause your dog to lick the anus excessively or scoot across the floor in an effort to alleviate the irritation. Occasionally a tapeworm will release its attachment to the intestinal wall and move into the stomach, causing digestive upset and resulting in and episode of vomiting. The 5 to 8 inch long worm may sometimes be observed in vomit. Though clinical symptoms are not common, especially severe tapeworm infestations may cause debilitation and weight loss if left untreated.

Because fleas are an important vector in the transmission of tapeworms, flea control is an important part of eliminating tapeworm infections. There are numerous powders, collars, and topical treatments available. Consult your veterinarian for recommendations and more information.

3.Roundworms

Canine roundworms belong to the ascarid worm family, members of which can infect dogs, foxes, both wild and domestic felines, and humans. These large worms live and feed in the small intestine of their host. Though all ages of dogs are susceptible to this parasite, puppies are generally hardest hit by infestations and may become seriously ill. Thankfully however modern medicine has provided us with a plethora of de-worming medications, so treatment and prevention of roundworms is relatively simple and highly effective.

Adult dogs become infected when they ingest eggs that have been shed by another animal in its feces. Older dogs that ingest roundworm eggs rarely fall clinically ill, though they may harbor larvae for the rest of their lives. Dogs less than a few months old are much more likely to become infected after ingesting eggs. In these cases the eggs hatch into larvae when first ingested, then migrate through the liver to the trachea. Once they reach the trachea, the larvae are coughed up and swallowed again. This time the larvae stay put in the intestine and mature into adult worms, ready to start laying eggs of their own.

The classic symptom of roundworm infection is a “pot-bellied” appearance, and other signs include lethargy, weakness, diarrhea, vomiting, abdominal pain, and a dull coat. Weight loss is often a sign of significant infection, and very large numbers of worms may sometimes cause an intestinal obstruction. Once suspicion has been established because of physical symptoms of infection, definitive diagnosis is based upon fecal sample examination. Characteristic roundworm eggs are readily visible in the feces of infected dogs, and your veterinarian needs only to examine a small sample under the microscope to reach a diagnosis.


4.Whipworms

Whipworms are small thread-like parasites that embed deep within the lining of the colon (large intestine) and cecum. Trichuris vulpis, the canine whipworm, is a common parasite and is a major cause of diarrhea in the dog.

Light infections of whipworms are difficult to diagnose, but they can lead to more serious problems. Large numbers of whipworms irritate the lining of your dog's intestine causing weight loss and pain. Watery and bloody stools may result. Severe infections can cause life threatening dehydration and anemia. Whipworms are not dangerous to people, but once dogs become infected, whipworms are difficult to eliminate without medication programs.

5. Heartworms

A parasitic roundworm (Dirofilaria immitis) that is spread from host to host through the bites of mosquitoes. The heartworm affects dogs, cats, wolves, coyotes, foxes, and some other animals, such as ferrets, sea lions, and even humans. The parasitic worm is called a "heartworm" because the parasite, in the final reproductive stage of its life cycle, resides in the heart of its host where it can stay for many years and may kill its host through congestive failure of the heart.

Heartworms go through several life stages before they become adults infesting the heart of the host animal. The worms require the mosquito as an intermediate stage in order to complete their life cycle and so at least two animal hosts other than the mosquito are required for the heartworm to reproduce.

The parasite is found in the pulmonary arteries and sometimes the right atrium.

Dogs show no indication of heartworm infestation during the 6 month long prepatent period prior to the worms' maturation, and current diagnostic tests for the presence of microfilariae or antigens cannot detect prepatent infections. Rarely, migrating heartworm larvae get "lost" and end up in unusual sites such as the eye, brain, or an artery in the leg, which results in unusual symptoms such as blindness, seizures and lameness. Many dogs will show little or no sign of infection even after the heartworms have matured. To some degree these dogs may be described as seeming to age slightly faster than normal as the worms slowly damage the lungs, kidneys and liver. These animals usually have a light infection and live a fairly sedentary lifestyle. However, active dogs and those with heavier infections will quickly show the classic symptoms of heartworm disease. Early symptoms include a cough, especially on exercise, and early exhaustion upon exercise. More advanced cases progress to severe weight loss, fainting, coughing up blood, and, finally, congestive heart failure.

Prevention is key here. By giving your dog(s) a monthly heartworm prevention medication such as Heartguard or Interceptor protects your dog from developing heartworms. However, if you fail to do so, or accidently miss giving them their monthly pill, your dog(s) should be tested. If positive, it is treatable and you should discuss it with your licensed vet.

Treatment and prevention for worms...

All puppies should be de-wormed starting at two weeks of age and every two weeks until they are a minimum of eight weeks. In addition, females should be treated both before breeding and again during late pregnancy to reduce risk. Periodic de-worming of adult dogs is probably a good idea and I definitely recommend it. Heartguard and other types of heartworm prevention medications will take care of some of the types of worms, but not all. This should be discussed with your veterinarian. Proper hygiene is perhaps the most important factor in preventing hookworm infections in both humans and animals. The prompt disposal of dog feces is vitally important, especially in yards, gardens, and public parks. Dogs should be discouraged from toileting in areas frequented by children, such as sandboxes or playgrounds. A bleach solution of 3 cups of household bleach to a gallon of water is a satisfactory cleaning agent for any surfaces you suspect may have been contaminated.

Brucellosis

Brucellosis is a disease of the reproductive tract which may cause abortion in females, infection of the sexual organs in males, and infertility in both sexes. It is caused by a bacteria of which there are several different types that infect specifically cows, goats, pigs, horses, sheep or dogs. Though there have been isolated incidences of dogs becoming infected by contact with livestock infected with one of the other species of Brucella bacteria, the bacteria that infects dogs specifically is called Brucella canis. It is spread by contact with the semen or vaginal discharge of an infected dog or bitch (most commonly during mating), by contact with mammary secretions and aborted puppies, and can also possibly be spread by contact with urine or other body secretions. In indoor kennel situations, it may even possibly be spread by the airborne route. It can be contagious to humans, in whom it causes flu-like symptoms.

Females: Abortion of litters, usually between 45-55 days after breeding, litters with some pups born dead or dying immediately after birth, and pups that die at the embryo stage and are reabsorbed -- in such cases it may appear that the bitch didn't take.

Males: Inflammation of the epididymis, prostate and/or testicles (often leading to testicular atrophy), infertility because of abnormal sperm and poor sperm motility, and reluctance to breed due to pain caused by inflammation of the sex organs. Males may also cause lesions by licking at the painful area.

Both sexes: Swollen lymph nodes. Some dogs may show non-specific signs of poor health, such as poor vigor. In rare cases the disease has caused damage to the kidneys and nervous system.

Perhaps the most dangerous aspect of the disease is it's insidiousness; the above symptoms are not always seen -- in many cases an infected dog may show no outward signs at all. Infected bitches will have normal heat cycles and breed normally, in fact in many cases a bitch infected with Brucellosis, after aborting a litter, may conceive and whelp a live litter subsequently. The danger in this is that such a bitch can infect any males she is bred to, and her puppies will most likely be carriers of the disease and go on to infect other dogs.

Additionally, because of the threat of transmitting the disease to humans, if you have a dog that tests positive for the disease in some states the health department can demand the dog be destroyed. The disease is most often transmitted to a human being by handling aborted pups from a bitch with Brucellosis. For this reason, if one should ever have a bitch that aborts or has stillborn pups, the dead pups, membranes, placentas, etc. should be handled with gloves and the area disinfected thoroughly. The bitch that had the pups should be tested for Brucellosis as soon as possible to rule out the disease as the cause for the stillborn litter.

The only prevention for this disease is to have all breeding stock tested for the disease before breeding. The test for the disease is a simple and relatively inexpensive blood test. As for humans, wear gloves and disinfect the area if you should have a female that aborts or has still born pups. Also, by testing your dogs and any other dogs you may mate with yours, you will be aware of whether or not the dog(s) have the disease and can then take the proper precautions.

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