Canine Parvo Virus Type 2 (CPV2, “Parvo”)
Canine Parvo Virus Type 2 is a contagious virus mainly affecting dogs and wild canines. The disease is highly contagious and is spread from dog to dog by direct or indirect contact with their feces. The virus can survive in the environment for several months. The disease can be especially severe in puppies that are not protected by maternal antibodies or vaccination. Parvo Virus has two distinct presentations, a cardiac and intestinal form. The intestinal form causes severe vomiting and diarrhea (often bloody). The cardiac form causes respiratory and cardiovascular failure in young puppies.
Symptoms include lethargy and loss of appetite, followed by fever, vomiting and diarrhea (often bloody). The virus attacks the intestinal crypts and the bone marrow, leading to a compromised intestinal tract and depressed immune system. The vomiting and diarrhea lead to dehydration and electrolyte disturbances. The normal bacteria that reside in the intestinal tract can cross into to bloodstream leading to sepsis, shock and death. Concurrent infestation with intestinal parasites or other infectious agents can allow the virus to be more deadly.
Treatment consists of intravenous fluids, antiemetics, antibiotics and electrolyte supplements, including dextrose and vitamin B complex. Survival rate depends on how early CPV2 is diagnosed, the age of the animal and how aggressive the treatment is. With severe disease, dogs can die within 48-72 hours without treatment by fluids and antibiotics. Vaccines can prevent this infection, but mortality can reach as high as 91 percent in untreated cases.
Hyperthermia (Heat Stroke/Heat exhaustion)
Heat stroke is a serious and often life threatening condition dogs are susceptible to whenever the weather becomes hot and humid. Dogs cannot sweat; therefore they do not efficiently handle heat stress. They exchange heat mostly through panting. Heat stroke is most common in large breed dogs, overweight dogs and dogs with short noses.
The most common clinical signs of heat stroke are weakness, loss of balance, excessive panting, increased salivation, loud or roaring breath sounds, mental dullness, collapse and death. Body temperatures over 106 degrees are a critical emergency and require immediate treatment. As body temperatures go above 107 degrees, organ damage occurs, shock and cardiovascular collapse ensues, brain swelling and disseminated intravascular coagulation (DIC) are common complications that result from heat stroke. If the body temperature goes above 109 degrees, the prognosis becomes very poor.
Death from heat stroke can occur fairly quickly. It can be as short as 20 minutes, as in a “closed car” situation. It is more common for dogs to experience heat stroke in the first few days of warm weather when they are becoming acclimated to the heat and for it to occur in conjunction with exercise or excitement. Heat stroke may occur within an hour or more under these circumstances, but could develop more quickly if the pet was already struggling with the heat prior to exercise.
TIME IS OF THE ESSENCE WHEN DEALING WITH HEAT STROKE. Immediate treatment is critical to success when dealing with hyperthermia. Delays can be harmful or even fatal.
- Come to the hospital immediately when a dog collapses. The amount of time from collapse to admission results in more cases of disseminated intravascular coagulation.
- Cool your dog off only if it will not delay arrival at a veterinary hospital. When cooling the pet, use cool water (not cold water) bathes or rinses. This should be done immediately for only a few minutes, then the pet should be taken to the veterinary hospital or veterinary emergency clinic immediately.
- Take extra precautions with overweight dogs on hot, humid days. Overweight dogs have a case fatality rate double that of normal weight dogs.
- If you have a bulldog, pug, Shar Pei, Pekinese or other brachycephalic breed, limit their outdoor access on hot, humid days. The short nose of these dogs may not allow adequate cooling on the hottest summer days. These breeds are twice as likely to develop heat stroke compared to other dogs.
- Large breed dogs, such as Golden or Labrador retrievers, Rottweilers and English bulldogs and Mastiffs are twice as likely to develop heat stroke as other dogs. They should be exercised only when the heat and humidity are low. Heat stroke occurs more frequently when the discomfort index is higher than average for a given day. Discomfort index is a measure of heat and humidity.
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Angel of Mercy Animal Critical Care
8734 Grissom Road, San Antonio, TX 78251
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