Why does my cat have loose stools, litter box issues, and eat a lot?
Hi there and thanks for your question.
Intestinal worms and intestinal parasites can be a cause of loose stools. If she has been tested for parasites and is negative for them, then this can be ruled out. It cannot be entirely ruled out with worming treatment alone. A fecal test is needed.
There are other causes such as a bacterial or viral infection, a food allergy, inflammatory bowel disease, pancreatitis, and certain types of cancers, especially cancers of the gastrointestinal system.
Eating more than normal as mentioned in your question may indicate an endocrine disorder such as diabetes or hyperthyroidism. Both of these can also cause loose stools.
Diarrhea or lose stools can be uncomfortable to pass. Cats do not show their pain very well to us at all so it can be hard to determine if Maisie is in pain, but if she is more vocal than usual, and very attached to you lately and this is not her normal behavior, then yes, it may indicate she is not feeling very well and is uncomfortable.
I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!
Updated on September 23rd, 2025