That's annoying!
Jackson tends to be a dog that gets humped a lot at the dog park, I think because he just allows it and doesn't really fight back... LoL. I don't have advice but it it is soooo annoying when owners don't do anything about it. I totally get dogs will be dogs but when Jackson is trying to run and he a dog attached to his leg and the owner is just sitting there, I just take it upon myself to get their dog off mine.... haha.
No real advice but can I just say Pnut has got to be the cutest Yorkie Ever?!? His haircut, his little face, his outfits.. gahh, he's sooo cute!