My cat is vomiting bile after new food. Does he need ER care?
I'm sorry to hear that Corndog has not been feeling well. Thank you for the thorough assessment and good work assessing his hydration! While a sudden change in diet may have caused gastroenteritis (inflammation in the gastrointestinal tract), I would expect to also see diarrhea in addition to his profuse vomiting. That does not necessarily rule out a diet change as an underlying cause, but it forces us to also consider other alternatives, such as a foreign body intestinal obstruction, pancreatitis, cholangiohepatitis (inflammation in the liver and gall bladder), viruses, kidney disease, among others.
To err on the side of caution, I do recommend taking Corndog to an emergency vet now rather than waiting another 7 hours. If he does have an intestinal obstruction causing his vomiting and dehydration, these are best managed when surgery is performed as soon as possible rather than waiting and risking the development of intestinal perforations and/or sepsis. The vet will be able to perform any necessary diagnostic testing (x-rays, blood tests) so that he can be treated appropriately (likely with IV fluids and medications). I hope that all goes well and that Corndog is feeling better soon!
Updated on September 23rd, 2025