What age is best for board and train?

In a 2014 study in Frontiers in Psychology, Wallis and colleagues tested 145 Border Collies aged from six months to 14 years. Selective attention and sensorimotor skills differed between age groups and peaked in middle age, roughly three to six years. Adolescent dogs, aged one to two, were slower than middle-aged dogs to make eye contact with the experimenter at first, yet they showed a steeper learning curve than the middle-aged group across the 20 trials, and they also beat the youngest group.

Puppies, adolescents, young adults and the oldest dogs were all slower than middle-aged dogs to find dropped food, and interest in a moving object fell with age, but attention to a person doing something unusual did not decline, and the authors concluded that even senior dogs can sustain attention when the stimulus matters to them. The study used one breed and compared age groups rather than following the same dogs, so treat it as a sketch. The sketch is useful: teenagers start scattered and improve fast, middle-aged dogs focus best, and seniors still learn what is relevant to them.

That stretch combines what a stay does well with the problems families most want fixed. Habits are real but not yet years old, the first socialization period is behind the dog, and the trouble is usually reliability: the recall that worked at five months and vanished at nine, the jump on every visitor, the lunge toward every gull on the Gloucester seawall. The Wallis finding fits too, since the one- to two-year-olds improved fastest once a task got going.

It is not a rule. A confident four-month-old short on manners may do well with the one-week Foundation program, and a calm adult can gain as much as any teenager. What argues against a stay at any age is the same short list: a fear period showing now, a dog that cannot eat or sleep away from home, panic when left, a sudden behavior change, or a family that cannot practice afterward. Our page on socialization windows covers puppy timing in detail.