Greyhounds are known for this. In the greyhound world, it's called nitting. Max used to do it when he was really excited. Once in a blue moon, he'd put my hand in his mouth and nit on that. I'm sure other breeds can do this as well.
Bo does the same thing as the greyhound..he gets excited and trembles/rubs his lower teeth on my arm...it's very humorous because it looks like h wants to play bite but just won't do it..he does this at least once a day or so...
Milo does it after he sniffs Kaci's privates sometimes...not sure why, but I don't think it's anything to be worried about or anything...it just seems to be a weird do thing.
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