Reasons for a Cat Losing Weight

It's more common for a house cat to suffer from obesity than weight loss. That's why it can be troubling to see a cat losing weight all of the sudden. There are some explanations, but consult your veterinarian right away if you notice significant change in your cat's weight.

  1. Age

    • Old age can bring serious health issues that might cause a cat to lose weight. But some elderly cats (say, 12 and up) become thinner just through the natural aging process. Some might eat less because their sense of smell has diminished or because they suffer from dental issues.

    Serious Illness

    • Cancer, diabetes, kidney disease, thyroid problems and inflammatory bowel disease all can cause significant weight loss in a cat. Certain viruses, such as the feline leukemia virus, can have the same effect.

    Parasites

    • Internal parasites, such as roundworms or tapeworms, can lead to weight loss. Keeping your cat free of external parasites, such as fleas, can help prevent internal ones.

    Hairballs and Blockages

    • Sometimes hairballs can harden and cause a blockage in the cat's digestive system, particularly in the intestines. This can prevent the absorption of nutrients. Any blockage is serious and must be treated immediately.

    Lifestyle Changes

    • A cat might stop eating if stressed. During stressful times such as moving or introducing a new pet, give your cat special attention. You also can ask your vet about other calming methods.