Babies should NEVER be allowed to pull up using a dog's leash and collar. This dog is being very tolerant at the moment but this one stops my heart! Notice how still the dog is, the tail, the closed mouth? All signs of stress not to mention the whites of the eye, licking lips and turning away. The more you are aware of how dogs communicate the better you can understand what your dog is truly enjoying or not. This one is stressed and NOt enjoying this!