My cat threw up grass. When should I worry about cat vomiting?

If she only vomited one time and seems perfectly fine then I don't think there is a cause for concern. If the vomiting continues, she has a decreased appetite, or is lethargic then she should be examined by a vet for treatment.

I'm sorry to hear that Dylan is experiencing so much vomiting. If it is still continuing, he will need to see his veterinarian. Profuse vomiting can have several causes, but the most worrisome is a foreign body obstruction. This occurs when a cat eats something such as a hair band, a piece of string or a toy. It then becomes blocked in the intestine causing the cat to vomit. I hope this information helps!

If it was an isolated incident and she's not acting sick otherwise, I would just monitor her closely. If she does continue vomiting or develops diarrhea, lethargy or poor appetite, I would be concerned and would take her to your family veterinarian for an examination.

While vomiting hair occasionally is normal for some cats the increased frequency you have described is concerning. It is possible at Midnight is grooming more due to a seasonal coat shedding or she may have some underlying intestinal irritation contributing to the vomiting. Cats that hunt are at higher risk for parasites and this can also contribute to vomiting. If the increased frequency of vomiting continues or if you notice any other signs such as decreased appetite, lethargy or weight loss, I would recommend that you have her seen by your veterinarian. They may recommend checking a stool sample for parasites and possibly blood work to rule out other potential causes for vomiting such as kidney disease or thyroid problems.

Some cats may eat grass to settle an upset stomach or to self induce vomiting. Cats will also eat grass due to boredom or simply because it tastes good. As long as Kitty is behaving normally, there is likely no cause for concern.

Poor Sonic! If he's been vomiting every day for a month, a vet visit is definitely warranted as this is not normal. He may have a GI problem such as chronic pancreatitis or a foreign body in his stomach, a systemic illness like hyperthyroidism or chronic kidney disease, or may have an allergy or intolerance to something in his diet. Your veterinarian can do some diagnostic testing if needed to help determine what is causing the vomiting and get him started on appropriate treatment.

I would definitely keep an eye on him, and if he vomits again or doesn't want to eat still, schedule a vet appointment. Issues such as minor GI upset, underlying illness, hairballs or obstructions, parasites, etc can all be possible causes of vomiting, which is why it's important to have it checked out if it continues more than once. If Lando seems in any obvious distress or pain (vocalizing, pacing, attempting to go potty but can't, tender to touch, etc), then he should be seen sooner.