One guy gets treated like an animal for another guy’s amusement, usually with a collar, leash, and commands like “sit” and “stay” while he crawls on all fours. The sex leans into dominance and obedience, with stuff like being walked around, made to present his ass, and getting fucked or used like a trained pup. You often see pup hoods, tails, and lots of praising or humiliating talk to sell the owner-and-pet vibe.