I rescued a female calico 7 months ago. She didn’t like her Blue wet Food so for the last month she has been eating fancy feast grilled wet food. I serve her a full can and she eats throughout the day. Today she threw up the whole can. Is it the food or something wrong? Pet's info: Cat | Domestic Longhair | Female | spayed | 7 years and 6 months old | 9 lbs

I'm sorry that Michu threw up! Given she has been eating the Fancy Feast for a month now, I would have expected if she was having a reaction to the food, it would have happened much sooner after the food switch. I would suspect that she may be suffering from a GI illness, may have eaten something rotten, or could have a foreign body. GI illness would be what I would suspect first. Given that she has thrown up only once, I can give you a home remedy to try. I recommend withholding food for 12-24 hours, then feeding a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in her normal diet. If the vomiting continues in the absence of food, she vomits the bland diet, develops diarrhea, stops drinking water, starts vomiting water, or becomes very lethargic, she will need to see a vet right away. Good luck, I hope this helps!

Changing food can cause gastritis/enteritis so it could be from the can of food. You could withhold food for 12 hours and if the vomiting and diarrhea stops then try a bland diet. You could buy a commercial gastrointestinal diet or try a little bit of boiled chicken and see how she does. If the vomiting and diarrhea continues or she becomes lethargic then she should be examined by a vet for treatment. She may need fluids, anti-vomiting, antibiotic, and a gastrointestinal protectant. Hope she feels better soon!