The owner kind of makes a weak attempt to seem like they’re trying, but if I weren’t there, they wouldn’t intervene at all. I’m asking because I want to make sure that I don’t over react next time.
Lot’s of comments about dominance. This is an old erronous theory about dog behaviour based on a botched study. Dogs hump for many reasons, sexual is the obvious one, but also being nervous or poorly socialised.
What you should do is stop the behaviour, move your dog or theirs away and tell the owner to come get their dog.
If it happens in certain scenarios you can also stop it before the behaviour, so a common scenario is two dogs are playing, one dog gets overstimulated and then jumps on to hump, in that scenario you’d want to watch for earlier signs of overstimulation, wanting to stop, panting heavily, whale eyes, and stopping the play at that point.