My cat is vomiting, losing weight, and has a huge appetite. Why?

Question

Hi...my cat had a bad reaction to a Hart’s collar.She was the runt of the litter and has never weighed more than5 lbs. I have her male littermate ( 13lb)My small female has never been the same since the Hart’s but is now vomiting, frequently defecating,and losing weight ( 1.5 lbs) She has a very Voracious appetite but food seems to go through her with no nutritional value.She defecates very large,malodorous stools that are so large ,they are comparable to human.i had extensive blood work done.OK. Pet's info: Cat | Domestic Shorthair | Female | spayed | 12 years and 8 months old | 3.5 lbs

C. Rathjens, DVM · Accepted Answer

Poor girl. It sounds like she's been to the vet and is hopefully under treatment. I can't tell from your question how long ago she had the reaction to the collar but get the impression it wasn't the last couple of days. I wouldn't expect on going issues if the collar was the only problem. If it's been more than a week or so, I would be suspicious that something else entirely is going on. Vomiting, diarrhea, and weight loss are the classic symptoms that cats get for nearly every disease, so it's hard to know what could be going on with her. If her blood work is normal, I would be concerned about something primarily with her gut such as Inflammatory Bowel Disease or Lymphoma. The next step is probably an abdominal ultrasound.

My cat is vomiting, losing weight, and has a huge appetite. Why?

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