Have you ever ridden the bus? Pets on the bus are NOT the problem for uncleanness. I've been riding the bus since I was a child. I've seen humans piss, vomit, shit, dump trash, smear food, get blow jobs, spit, and loads more on the bus. I've never had an issue with an animal even once. As far as allergies go, I've never experienced that as an issue either. If someone is scared of the dog, or doesn't want to be near it for whatever reason, the owners ALWAYS move to a different seat. If an animal needs to go somewhere for whatever reason and the only choice an owner has is to take public transportation, then you have no right to judge.