Not my dog to leash

When someone who is not your significant other but is someone else’s is acting out/exhibiting obscene behavior or unnecessary aggression; when your ex is hoeing around.

Fred: Why is John’s girlfriend coming at me crazy?

Alex: I don’t know, man. That’s not my dog to leash.

Fred: Bro your ex is really getting around.

Alex: Not my problem anymore. Not my dog to leash.