Why is my cat losing weight with diarrhea and food allergies?

Question

my cat has diarrheas for food allergies, she bleeds if she eats fish and can only eat beef but all the beef foods contain fish or chicken, she lost weight. Pet's info: Cat | American Shorthair | Female | spayed | 15 years and 10 months old | 8 lbs

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

Food allergies could be one of the reason for the persistent diarrhoea and weight loss, but these conditions must be differentiated from IBD (inflammatory bowel diseases) and unfortunately from more sinister conditions like tumors. Weight loss in old cats can have different causes as well, and endocrine diseases (hyperthyroidism and diabetes mellitus) are frequently associated with intestinal diseases as well. Considering all these possible clinical scenarios, I would recommend a check up and more tests (blood test+urine analysis including thyroid hormone and feline pancreatic lipase and possibly an ultrasound of the abdomen) to determine underlying cause and treat appropriately. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

Why is my cat losing weight with diarrhea and food allergies?

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