Petco Text Logo
Petco Pet Logo

Why is my old cat lethargic, aggressive, not grooming, and wheezing?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 12 years and 9 months old | 20 lbs

my 13 yo female feline is refusing to groom herself, very lethargic, wheezes when breathing, and has a foul smell. she is also being very aggressive to the other animals and myself by biting, hissing, growling and slapping. shes always been the alpha but this is getting out of control. front declawed, spayed and never goes outside unless its on screened porch. she eats and drinks, not as much as before, but isn't dehydrated or hungry. Using litterbox normally

1 Answer

Most Helpful Answer

Image profile

Answered By Chad Brown, DVM

Veterinarian

Published on July 5th, 2018

Poor Claire. She sounds like she really feels bad. A cat that is 13 years old that is displaying the symptoms that Claire is definitely in need of some veterinary attention. Five of the most common diseases for a 13-year-old lethargic, non-grooming cat are kidney disease, liver disease, hyperthyroidism, cancer, and diabetes. The good news is that most of these diseases are very treatable and can give her a good quality of life. Of course, she could have other things completely causing this behavior but we always start with looking for these five I urge you to take her to the veterinarian as soon as possible to get a full CBC blood chemistry profile, thyroid hormone analysis, urinalysis, and abdominal x-rays performed. I realize that this seems like a lot and it is. But these tests, however, are absolutely necessary to make a diagnosis and begin treatment before Claire gets much much sicker and harder to treat. Thank you very much for your question and I hope I have provided enough information to answer your question

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored