My girls both wear a harness. When Lottie was a puppy she wouldn't walk with the lead at all- sure appeared to be scared of it. But now they love their harness and bark wildly as soon as they see them. I don't think that we get the Puppia ones out here. The ones my girls wear are the ones that are also approved to be used with the seat belt in the car as I always make sure that they have them on whenever they travel in the car and they settle down really well. My vet has never said anything about them wearing their harness. Julie and the girls