>

So either you've never had a pet, or you don't know what mammals are.
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Remember, /r/Showerthoughts is for showerthoughts, not "thoughts had in the shower!"
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Pretty sure I have seen dogs "trimming" their nails by chewing them >

Dogs and cats both >

Yeah, cats' claws seem to grow from the inside out, and they use their teeth to  pull off the outermost layer (and leave claw husks on your bed) >

Or in your carpet/rug so you step on it. You thought legos were bad…