he ran away yes and petaltail, if you want you could start reading warrior cats. No, they do not put collars on them. They are wild. Infact, Max is lucky he got accpeted as a kittypet which is a cat that was owned or still owned by humans or "twolegs"

Have you seen Sasha

Oatmeal wanted to keep her kittypet name Max and Oatmeal are run away kittypets

And Max's collar was too tough to break or rip. He has a backstory and a whole storyboard so he does lose his collar at one point

OH YEA

They're clan is small and everyone is valid