When I was a kid, about 10 or so, I had a basset hound named Amy. She was amazing. Everyone loved her. Total neighborhood dog that everyone in the neighborhood felt like was their baby, too.
We also had a bully named Travis who was an awful little shit. We all generally avoided him, even when he would throw shit at us or hit us.
My friend Hailey was super nonconfrontational. But when Travis intentionally ran over Amy with his bike, Hailey ran after him on foot, managed to catch him as he peddled his dark and stinking heart out, ripped him off his bike by his hair, tore the chain guard off of his bike, and beat him so badly with that by the time the rest of us had caught up to the two of them to pull Hailey off or Travis she had broken his nose, gashed his arm, and broken two of her own fingers, presumably on his face.
Travis never fucked with our dog again