It never fails. When I take my beautiful little miniature Chihuahua Sandy Lee out for a walk around the neighborhood, we invariably cross paths with some dog 6 to 10 times Sandy's size. And there she goes...barking and growling and tugging on the leash, trying her darndest to "go and get 'em". Generally, the other dog (who could probably swallow Sandy whole with a single gulp) doesn't even bother barking back. I figure they just don't feel threatened at all, and are actually pretty amused themselves. Maybe Sandy was a wild, rabid Tibetan Mastiff in a past life, roaming the open plains? Gosh, I love her.