I know nothing of the co besides they are large dogs that look like grizzly bears.I remember seeing the t.v show desinger dogs and thinking that these dogs were amazingly athletic for there size and very impressive dogs,and very very large.It was impressive to see a giant of the dog world jump 3 feet in the air when the dogs were in the kennels.. I dont believe its the best idea for the breeder to advertise the dogs as having the knockdown power of a 45>magnum even if they do,imagine what kind of drama that would cause if it were a apbt or presa breeder..The guy who couldnt control the 180 pd co was a joke ,if you cant control your dog you probably have the wrong breed for you...