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    Pet Symptoms: 6 Signs of Illness in Your Dog or Cat

    What our sick pets can’t say in words, they’ll demonstrate through physical symptoms and behavior changes.

    Lack of Appetite or Decreased Activity continued...

    What about this pet symptom: the cat or dog whose energy level drops? "It's just one of those very vague things that tell us that something is not right," Sawchuk says. Many things can cause lethargy, including major problems, such as heart disease.

    A pet whose lethargy can't be pinned on an obvious reason, such as from an extra-long run at the dog park, may need to visit the vet, especially if other symptoms arise, such as change in exercise tolerance, weakness, collapse, or loss of consciousness.

    Urinating More or Less Frequently

    As Mitchell discovered with Monty, excessive thirst and urination might spell diabetes. But increased urination may also signal liver or kidney disease or adrenal gland disease.

    With increased urination, housebroken pets might start wetting inside the house. Or a dog that usually sleeps through the night suddenly needs nocturnal bathroom trips, Meadows says. An owner might notice, too, that he or she is filling the water bowl more often.

    In contrast, too little urination, or straining to urinate, often signals a urinary tract problem or bladder stones. These are urgent reasons, especially for cats, to see the vet.

    "Cats can get an accumulation of crystals in the bladder or stones in the bladder that create bladder inflammation and can cause blood in the urine," Meadows says.

    In male cats, crystals or inflammatory debris can plug up the urethra so that the cat can't urinate, which can become life-threatening within 24 hours.

    "It's a hard thing to pick up because the only thing you might see is the cat making multiple trips to the litter box and just sitting there," Meadows says. Or cats that strain to urinate might change their habits and start urinating outside of their litter box, for example, into the sink or on bedding and furniture.

    Sawchuk, who lives in Wisconsin, says that with the first snowfall, many people will report that their dogs have bloody urine. The problem may have existed for a while, but the owners didn’t notice, Sawchuk says. "And now, [the urine] is in the snow and it’s pink, so we get a lot of phone calls."

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