Hi, All collars have the potential to injure the dog and so do head halter type collars. The answer is in teaching your dog to focus on you and let the dog know what is expected of him. How many times I see people hauling their dog around with the dog gagging and the human straining on the other end. I dislike choke chains but will use martingale collars and that includes the prong collar where the situation necessitates. It is not the collar that causes the injury but the human on the end of the leash.
Rose T.
