Dogs, like humans, can get sick and die from diseases. A difference exists, though, between what is fatal because no cure exists and what is fatal due to improper care of the dog. Many diseases exist that may affect dogs, and some are extremely common. Proper vaccinations and veterinary care reduce the chances of disease becoming fatal.
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Cancer
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Cancer in dogs can prove fatal. Even if the cancer is found in its early stages, the dog may not be able to beat the disease. Symptoms of cancer vary depending on type, but general symptoms include lethargy, loss of appetite, change in personality, persistent abnormal swellings, offensive odor, sores that do not heal, persistent lameness and difficulty breathing. The symptoms of cancer may be similar to many other diseases that dogs may have, so the only sure way to know is to take the dog to the veterinarian. Depending on the cancer's type and how advanced it is, the dog may survive.
Hepatitis
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Hepatitis infects dogs and is highly contagious among canines. This viral infection can potentially cause immediate death to the dog. Symptoms include a high fever, loss of appetite, pain in the abdomen and jaundice, which is indicated by yellowing of the eyes. Unfortunately, not all dogs have symptoms, so this disease can be difficult to detect. Treatment for hepatitis is not usually successful and is expensive. However, if you keep your dog's annual vaccinations up to date, it is less likely to contract hepatitis.
Distemper
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While vaccine can usually prevent distemper, once your dog has it you will find it difficult to beat. Distemper is infectious, and symptoms typically include a fever, trouble breathing, discharge from the eyes, loss of appetite and lethargy, progressing into more serious symptoms like muscle spasms, convulsions or even paralysis.
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