Our 3 hounds could easily pull us over with a combined weight of 33 stone.
However they know not to pull, I fell over them once on ice, and carakeel fell over them once and was knocked out cold, that was more due to her poor mobility, she only takes one at a time now and she can only manage one on a good day, I take the other two. It does make me laugh and annoyed when I see a little terrier dragging its owner down the road! If people cant train their dogs they shouldn't have them.