I can't really say that I dislike a certain breed. But, there are some dogs that make me (even though I've got my own Cookie always with me) change routes.

As a child, a Belgian Shephard (large and black with big teeth) came running towards me and my dog and took a painful bite out of my leg. Ever since I'm very much afraid of those and keep distance even though I know that it was just because that particular dog was brought up by a mentally disturbed person.