[QuickSilver]

Is it possible that he does play a little roughly with smaller dogs? A lot of times bigger dogs hurt their small playmates unintentionally. I wouldn't care if Thor was playing with a ten pound dog, but if he was getting pinned a lot, or seemed scared, I might tell the owner than their dog is "too big". Also, sometimes really small dogs get freaked out by someone who is even a little larger than them, so even if your dog is mellow and friendly, other dogs might be scared of him. That is one thing that drives me crazy, when owners of German Shepard's or Rottweilers refuse to call their dogs off Thor, because their dogs are "friendly". I was at a yorkie meet the other day, and a couple people came by with large dogs, who probably were fine, but like 85% of the yorkies went batsh*t. Finally we had to tell them to leave - it was like, do you not hear the twenty-five yorkies barking at your dog?

Or maybe the owners are just too sensitive, I don't know, just making a guess.

And yes, according to a lot of people, "real dogs" don't weigh less than ten pounds, so there you go.