There are several types of collars and harnesses out there. A good rule to remember is “how would you feel if it were used on you?” Standard, Choke, Prong and Electrified Collars – only attach a leash if you are an expert in each one’s application. They can cause serious physical or mental harm to your pet. Head Collar/Snout Harness – great for dogs that do not make sudden dashes to the end of their leash. They can cause neck/spine injuries. Off-neck Harnesses – come in chest, back or combination attaching rings. These are all good for most dogs that pull when fit properly.