My cat is vomiting and hissing after booster shots. Is this normal?

This can be normal! You can see some vomiting after getting vaccines and given that Faelan only vomited once, I would not be too worried. Plus he sounds like he is otherwise acting normally. I would keep an eye on him and if you see protracted vomiting, diarrhea, signs of an allergic reaction (facial swelling, difficulty breathing, then I would be worried and rush him into an ER vet immediately. I hope this helps!

Thanks for using Petco Pet Education Center, formerly Petcoach! Possible side effects after vaccines include pain at the injection site, lethargy, inappetence, vomiting and general discomfort. This should subside within 1-2 days. The vomiting could certainly be due to other reasons like gastroenteritis. If it does not improve or it worsens, have him evaluated by a veterinarian for further assessment and treatment. Otherwise, him will likely start feeling better shortly. Good luck and best wishes!

I am so sorry that your cat Milo is ill following vaccines. These are classic signs for a vaccine reaction, and therefore I recommend having him seen by your vet right away. If you vet is currently not open, then I would consider taking him to your ER vet to make sure he is stable and ok. He will likely get medications (antihistamine +/- steroids) to help combat the reaction. I do hope that your pet Milo is able to make a full and speedy recovery. I would notify your vet about this as soon as you can so that precautions can be taken next year when he is due for his vaccine boosters to help prevent this from happening again. Best of luck and take care!

It is certainly possible that he is having a vaccine reaction. If tomorrow morning he isn’t back to normal then I would call for a follow appointment with your veterinarian as soon as possible. They many need to give him some medication for nausea. Also, they will want to document the possible reaction so that next time he needs vaccinations he can be given medication ahead of time to prevent a reaction. Best of luck and I hope he improves soon. Thank you for using Pet Coach.

You can see some vomiting after shots, and while it is concerning, it doesn't sound like a lot of vomiting. I can give you a home remedy to see if that helps Dexter. Withhold food tonight, then feed 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 his normal diet. If the vomiting continues in the absence of food, he refuses to eat the bland diet, he vomits the bland diet, develops diarrhea, stops drinking water, starts vomiting water, or becomes very lethargic, he will need to see a vet right away.

This is very common after vaccines. Let him be alone tonight and let him rest. I would not be concerned unless he starts vomiting, having diarrhea, has hives or a swollen face. If any of these symptoms are noticed that I would contact your vet as this is likely a vaccine reaction. Also make sure he is still eating. He may not eat tonight but his appetite should pick up by tomorrow. If he isn't starting to act more normal in the next day or two, contact your vet for an exam.

This can be normal. Getting vaccines can cause a cat to feel off for a couple of days. I'd just keep an eye on Baby for now. If you see a lot of vomiting, diarrhea, severe lethargy, facial swelling, hives, or difficulty breathing, that is not normal and she will need to see a vet immediately. Otherwise, this should pass shortly. I hope this helps!