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See also The Koehler Method of Guard Dog Training. An improperly trained attack dog can be dangerous to its owner. Dogs made 'mean' through brutal and so improper training methods are unreliable and so not safe around other living things. Statistics from the Centers for Disease Control and the Humane Society of the US show that the most likely victim of a dog's aggression will be its owner, a family member or a neighbor; in six out of ten cases, it will be a young child. The K9 unit officer reported that his field experience strongly supports the claim that black dogs are more of a deterrent. Koehler gives a list of dog breeds pp. 36 52 to look at if one seeks watch, protection or attack capabilities: Airedale P, Belgian Sheepdog P, Belgian Tervuren, Bouvier des Flandres P, Boxer P, Briard P, Bullmastiff, Chesapeake Bay Retriever, Chow Chow, Collie, Dalmatian, Doberman P "one of the best choices", German Shorthaired Pointer, German Wirehaired Pointer, Great Dane, Great Pyrenees, GSD P "there is not a finer working dog than a good GSD", Kerry Blue, Kuvasz, Newfoundland, Rottweiler, Saint Bernard, Staffordshire Terrier P some, Standard Schnauzer, Weimaraner. A "P" indicates suitability for police work pp. 78 79, with Giant Schnauzers added for this purpose. Dachshunds and some Toys can also be good watchdogs. or withers, as it's called; dog heights are standardly given in this way.