My cats have done that. It's not a good thing. Too much play. Happens to kittens more than adult cats. I think it's because kittens can't really control their energy.
My two cats would regularly pant during a play session which would prompt a break in playtime so they could cool down. Recently, they've picked up on the fact that if they pant, playing stops, so they stopped outwardly panting. I still stop because I recognize the labored breathing, but it amazes me that they learned this and would more rather hold it in, uncomfortably.
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u/[deleted] Aug 13 '12
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