The fact is that ear infections are common in all sorts of breeds , whether they have cropped ears or not . As a veterinarian with 32 years of experience treating hundreds of thousands of dogs during that time , I cannot find medical justification for cropping a dog ' s pinnas outer ear . <| sep |> The first ones here to have that system , the awful dozen or so Novabus lowfloors that got purchased around 2000 or so , never seemed to work consistently in opening the rear door . But nothing about those buses was any good . It seems a dumb system anyway . The old Brill electric trolleys had a step that hit a switch when a person stepped on it and that opened the door . The older GM diesels had a push to open bar on the door that had an interlock of some sort . I never liked waving at the door to get it to open .