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Why is my senior cat lethargic, losing weight, and peeing outside box?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered

My cat has been lethargic, has some eye discharge, lost weight quickly, and only eats a little of his food. I dont know if this is due to old age (he is between 13 and 14), or if there is something very wrong. He also has been peeing on beds, which is very unusual, and seems to sometimes have a little bit of trouble walking.

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on December 23rd, 2016

Poor Nelson! From your description, I would say that something is definitely wrong. 13 or 14 years is really not overly old for a cat, certainly not old enough to cause these symptoms due to "old age." Some common causes of weight loss, decreased appetite, and acting lethargic along with peeing in odd places and difficulty walking would include diabetes, hyperthyroidism, or chronic kidney disease. I would recommend having Nelson examined by a vet as soon as you are able to - he/she can do basic blood work and a urinalysis to check for these problems and help determine what is causing his symptoms. In many cases, these illnesses are quite treatable once a diagnosis is made, so there's a good chance that your vet will be able to help.

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