It could be a sleep thing, a hygiene thing, or a food thing. If it's odd, I want to know. Share!
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My doggo loves to roll on bones. Not real ones, but toy bones. No others will work for her, it HAS to be a bone. I have no idea why.
my cat gives love nibbles like he won't actually bite but will politely nibble on your finger when you're petting him. Probably more comment than I think but he's a very normal cat overall