"Puppyhood" refers to the time period when a puppy is growing up and learning about the world. It is similar to childhood in humans, where puppies develop physically and mentally, acquiring new skills and experiences. Full definition
Border Collies who don't live on farms also need extensive socialization from puppyhood in order to learn how to live with people and other pets. (soonervet.net)
It's best to start the procedure during puppyhood since puppies are easier to control. (dogs.lovetoknow.com)
If a dog is trained in puppyhood with a crate, it will not always require crating. (grca-nrc.org)