Every dog has the instinct to learn various skills, but the degree of mastery of skills often varies from dog to dog, which is related to the breed, personality, age, neurotype, etc. of the dog. Therefore, a strict selection of dogs should be made for training. Of course, due to different purposes, the conditions for selection are also different. Generally speaking, in terms of body shape and appearance, it is required that all parts of the appearance are well-proportioned, muscular, strong and strong, posture is correct, and movements are alert and flexible. The age is generally from 3 months to 1 year old (basic training starts from 3 months, and special training is available from 7 to 12 months). In terms of neurological types, lively and excitable dogs are best, but quiet dogs can also be used. The nerve type of the dog can be easily determined by observing and studying the dog's response to different stimuli under natural conditions and during training. The method of judging the nerve type of the dog can be found in the personality check item in the special examination of the dog's personality.

Dogs with predominant hunt, active defense, and food responses should be selected. Any dog with a slow response, or a dog with a dominant search response, passive defense response, or a dog with a degenerated hunting reflex (not excited by the title) can not be used as a trainable dog.