Animals skin (at least dogs, which is where my experience with this is coming from) isn’t attached to their bodies the same way our skin is. I’m not going to pretend to understand on a scientific/biological level, but I know that for my dads terriers it apparently something to do with self defence like an animal can get a mouthful but the dog can still twist and roll around where as if I pinned your shoulder skin in a vice you aren’t turning around to do shit about it without tearing something
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