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Why is my cat weak, throwing up white foam, and has black feces?

Updated On September 23rd, 2025

Pet's info: Cat | Siberian | Male | neutered | 4 years and 3 months old | 8 lbs

My 3 year old Silver Tabby has had crystals, had the op 5 months now and is on urine diet. He throws up white foam only, he's lost a lot of weight and loss of appetite. He's extremely tired and weak. He is dehydrated despite urine pouches. Eats regularly. He's shows sign of fatigue. He sleeps a lot more so maybe depression? Three days ago I noticed an increased heart rate. He has had difficulty breathing as if it could be an anxiety attack. He also has black feces. He now walks at slower pace.

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1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on April 29th, 2017

These are very serious signs and require urgent vet assessment. It sounds like he has a bleed in the stomach or bowel and i would recommend blood tests to rule out internal complicating factors such as kidney or liver disease as soon as possible

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