Anyone who does it for fun is a piece of shit. The dog can't fight back.
If it's attacking you, then I'd do it too; kinda like how Will Smith did his dog in that movie. I occasionally play like this with my dogs but I never intend to harm it, it's just me playing with my dogs.
"Only on this forum can you be considered a thug when you train low income children for free. This place makes me fucking sick!!!" - SergioMartinez