By what system are animal suffixes assigned?

Hi, I was hoping to find some advice here! I noticed animals in compound words often have their own suffix (is that a suffix?), such as ookami becoming -rou, or inu becoming -ken. But I’ve heard -ko for several animals: sharks, foxes, tigers, and probably others I’m not remembering. Is there any system to what suffix an animal gets and why some share a suffix? And how do they become so different, like neko – byou, whereas the bear (kuma) simply becomes washbear (araiguma)? Thanks in advance!

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