I would think so. Wait, did Marge keep other dogs than bulldogs? Hum... I don't think so. But still, I think that he would still dislike dogs in general, even with Fang to prove him wrong. (Remembered, Fang slobbered a lot.) So maybe not just bulldogs, but other dogs too. (And remember, since Harry is not well versed in different bred of dogs, I don't think he could tell a bulldog apart from a Pit Bull, or whatever, so that might fuel his hatred, too.)
Hope that helped!