I agree with you man. I've had a big dog before and they LOVE playing rough. My dog use to kick my ass (I was 12) ROFL and LOVED it when I would play rough back.
Now, I've got 2 small dogs (dachshunds) and I play rough with them. Though nothing like kicks to the head or anything

but they love to be smacked around. If you watch them play, they bite each others ears and pull them down the fucking hall way.
People just need to mind their own fucking business. If you hear a dog yelping all the time like it's getting fucked up. Sure call the cops but otherwise stay the fuck out of pther people's koolaid.