5. Stopping eating and/or drinking
A cat who won’t eat often means serious trouble.
It is not normal for any individual to go a full day without eating when food is available, and not eating can be a symptom (kidney failure, complications of diabetes and intestinal obstruction) and a cause of (fatty liver) major health problems.
6. Protracted vomiting and/or diarrhea
This is among the cat emergencies that require immediate veterinary attention, especially when blood is present.
Almost all cats occasionally yak or have soft stools, and such incidents usually aren’t emergencies. But cats who vomit repeatedly or have blowout diarrhea should see the vet immediately.