My cats ate treats, now vomiting, diarrhea, not eating. Is it serious?

It's now a medical emergency that Bunty hasn't eaten in 18 hours. If she goes much longer without eating, she will develop a fatty liver which is fatal without treatment. She is quite sick and cannot be treated at home. Please take her into a vet immediately. Best of luck.

It's actually very serious when a cat won't eat, as if they go long enough without eating, they can develop a fatty liver. A fatty liver is fatal without treatment. I would take Cherry into a vet now.

Take Piper back into a vet immediately. It's extremely serious when a cat won't eat, and if they don't eat going on 72 hours, they will develop a fatty liver which is fatal without treatment. Please take her into a vet now. Best of luck.

I would err on the side of caution and get them seen today if you can, tomorrow, especially if they don't seem better. The vomitus looks like a hairball to me, but it's hard to tell. They may have overeaten, but unless that's something they already do, given the opportunity, I don't see that being as likely as something else, possibly getting into something they shouldn't have. Your vet will do an exam, possibly bloodwork, and maybe more//other diagnostics depending on what they find. Based on these results, your vet will have a better idea of what's going on and be able to recommend a treatment plan if needed.

It's actually a medical emergency when cats do not eat. If they go long enough without eating, they develop a fatty liver which is fatal without treatment. Flora could have a severe dental problem preventing her from eating. Please take her into a vet now.

Poor Snow! If he has no energy and can't even stand up, this is a very serious problem - he needs to see an emergency vet immediately. This would not be caused by withholding food for 10 hours; severe lethargy or weakness like this is generally a sign of a serious illness such as feline panleukopenia. Your vet can do some diagnostic testing to help determine what's wrong and get him started on appropriate treatment. I would recommend taking him to see the vet right now, as this may be a life-threatening problem.

Oh no, poor Toffee! She sounds quite sick at the moment, and her vomiting and diarrhea could be caused by a GI illness, eating something rotten or toxic, a foreign body, or pancreatitis. I see that she isn't spayed, and her symptoms could also be caused a pyometra, which is a life threatening infection of the uterus. When a cat is having both diarrhea and vomiting, it's time to see a vet immediately to prevent her from getting severely dehydrated and sicker. She does need veterinary attention now, please take her into an ER vet clinic; if there isn't one in your area, there will be a vet on call for emergencies. The information to reach that vet is found on a clinic's answering machine or website.