Originally posted by knighttemplar1960:

Tame boars don't attack wild boars, tame wolves don't attack wild wolves, tame lox don't attack wild lox. That's a feature that lets you pen a wild animal with your tame one and they won't attack each other while you tame the 2nd animal.

Tame animals won't attack other tame animals so you can pen all types of tame animals together.

Yeah it’s a lazy feature around what, building a separate pen till the second one is tame and then moving it.