If you are non-german or OOTL:
One refuses to bite a demonstrator (who is protesting against Nazis) even though it is literally shoved into one, and the other one just bites another cop.
Could have been the new owner who dumped a retired K9 at the pound, perhaps since sometimes those dogs have PTSD and can be more of a challenge than expected, or the owner died. Animals wind up in odd places for many reasons.