The cat vomited and didn't eat after changing the cat food, largely because the cat had a stress response to the new food.

I want to replace the cat with a new one The food needs to be gradually transitioned, instead of giving all the new cat food all at once, so that the cat will not only vomit, but even cause diarrhea. You can add a little new cat food to the old cat food first, and keep increasing the amount of new food every day until the old cat food is completely replaced.

In addition, in order to avoid the cat's gastrointestinal discomfort, you can also add an appropriate amount of probiotics to the cat during the change of cat food. If the cat's vomiting still does not improve after doing so, it is recommended to take the cat to the veterinarian to check for other reasons.