Hi there! My name is XXXX, XXX I would be happy to help you with your problem.

Does she seem to be having any difficulties breathing?

Hello! Are you able to see my previous question?

Has she vomited at all since the episode of gagging?

Just to be on the safe side, are you able to lift up her lip and tell me what color her gums are?

Okay, thank you! Gagging in cats can be caused by a lot of issues. It could be coughing that you are hearing, or a precursor to vomiting that she never got up. Sometimes kitties drink too quickly, and can inhale a bit of the water, which can cause irritation to the trachea.

Considering that she's breathing okay, she's not vomiting, and her gums are a normal color, you probably don't need to rush her to the ER tonight, but you probably should get her into the vet to have some x-rays done. If what you saw was coughing, the vet will want to check out her heart and lungs.

If it was vomiting, or her attempt to vomit, they might wish to check her out to ensure that she has nothing blocking her intestines or stomach, like a mass.

Keep a very close eye on her tonight, and if she starts to develop any difficulties breathing, if she starts to vomit on a more regular basis, shows signs of pain in her abdominal area, is strining to defecate, or her gums turn any color other than a nice pink, you will want to get her in sooner.

It's very possible that she has a little bit of gastroenteritis, and the gagging may have been a reaction to any nausea she is feeling. But it is always a good idea to get things like that checked out in an older cat.

It's basically inflammation in the stomach or intestines. This can be caused by a virus, eating a substance that irritated the belly (like a food intolerance), a bacterial infection, etc.

It's a blanket term for an "illness" that can cause a short period of vomiting and diarrhea. Usually a vet will prescribe an antibiotic medication like Metronidazole for the belly, have you withhold food for 12 hours, then feed a bland diet of 1 part boiled white chicken meat mixed in with 2 parts cooked white rice until the symptoms subside before having you return to a regular diet.

In older cats vomiting and gagging/coughing can be signs of other diseases though, so getting her into the vet to be checked out is important.

You are most welcome! Good luck with your kitty, and I hope she comes back with a clean bill of health! Keep me updated, and if you have any follow-up questions, don't hesitate to come back to this thread and reply.