Join Date: Nov 2014
Location: Los Angeles, CA
I have some experience in this area. Jasper is also doll-faced. When he was little and played with reckless abandon I could have him with his mouth open, panting, in 15~25 minutes of intense chasing-type play. These days, he's considerably more regal (read: less inclined to chase things) but I can still coax him into panting with the right toy, usually after ~15 min of chasing.
Other than when he is panting from exertion, I've never seen Jasper mouth breath. When I told my vet about this (it worried me slightly too) she laughed and said he's fine and that it's common for Himalayans and Persians. So if that's the only time you observe this, I would think you'll be OK. There is definitely always something to be said for taking a 'better safe than sorry' tack with preventative health measures though, and I would encourage you to mention this your vet next time you go if you don't want to make an appointment for this specifically.
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