A collar that has a double row of 20 (or more) 2-inch long metal spikes with sharp points.

 A chain runs through each end and is connected to one solid steel ring that is attached to the leash.  Some trainers start their training by using a spike collar; the majority only use it when a dog becomes resistant to the low-level pain from the choker collar.  Normally, the spike collar is used as the next step up in progression pain.

 The spike collar delivers much more pain than a choker collar.   

 A correction is applied by forcefully jerking the leash.  This causes all the spikes to be drawn inward, simultaneously collapsing against the dog's throat, which sinks the spikes deep into the sensitive nerves; sometimes when jerking, it turns in a circular motion, ripping hair and skin from the dog's neck.  With every jerk, there is possible and highly probable damage to the trachea, larynx or esophagus; possibly even pinching a nerve, causing temporary or permanent nerve damage, or worse yet, the dog could become completely paralyzed! 

 This method is effective, but an extremely painful way to train any dog.  

 Dog owners who use this method are usually just uninformed, which is where Ohio State K-9 College comes in.

 Dog Trainers that use this method usually justify it for the money. 

 We think dog owners should know better; unfortunately many don't.  However, after witnessing the interaction between our Master Trainer and their dog, our customers realizes how we continuously prove that the choke and spike collar methods are inappropriate and unnecessary.  Some dog owners (especially men) tell us they thought physical domination is the appropriate way to train a dog. 

 Would you do this to correct your best friend?