for the adult puppies. the lessons that they learned from the beginning will be really crucial.
actually, the perfect age to start training is from the beginning. it is better from the first time when they are born.
when they start to live in the world, automatically they learn about the environment and the situations around them. they start to learn to drink the milk from their mother. they start to recognize the mother and the other puppies. they learn to stick out their tongue. then, for some days they will learn about how to make a sound and see the surrounding.
then, people can start to teach them from the beginning too. 