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Hello. Thank you for asking your question. My name is***** will try to help.
So if you just picked him up from boarding he may be stressed. Cats often vomit when they are stressed.
I would think boarding would be stressful for him.
To reduce stomach acid you can give 1/4 of a 10mg Pepcid aC tablet every 12 hours.
You can put it in a treat. If he is not eating you can crush it and give it with water in a syringe or eye dropper.
If he does not eat for 24 hours or drink for 12 hours he should see the vet.
If you see bright red blood in his vomit and there are more than a few drops then she should see the vet as well.
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