From the link I posted:
3. The pups need to be trained to rest calmly in separate crates while they are young. Putting two dogs in the same crate causes all kinds of problems, including excessive stress, fighting, and an over-dependence on each other. If there’s a mess, both are confined in it. Neither can get away from the other, and that’s just not natural for dogs. Plus, they very much need to learn while young that it is safe to be alone. And they need to bond with humans, which is hard for them to do when they spend all their time with another dog.
4. Each pup needs plenty of outings with humans without the other pup. This is an essential part of the pup developing an individual identity and the ability to function without the other one. It also gives the pup a desperately needed opportunity to bond with humans.
5. Each pup needs to be trained as an individual. When you have one puppy, a lot of training can happen around the house in the course of the day. Having two puppies complicates things. The outings will give you necessary opportunities to train the puppies away from each other.
3. The pups need to be trained to rest calmly in separate crates while they are young. Putting two dogs in the same crate causes all kinds of problems, including excessive stress, fighting, and an over-dependence on each other. If there’s a mess, both are confined in it. Neither can get away from the other, and that’s just not natural for dogs. Plus, they very much need to learn while young that it is safe to be alone. And they need to bond with humans, which is hard for them to do when they spend all their time with another dog.
4. Each pup needs plenty of outings with humans without the other pup. This is an essential part of the pup developing an individual identity and the ability to function without the other one. It also gives the pup a desperately needed opportunity to bond with humans.
5. Each pup needs to be trained as an individual. When you have one puppy, a lot of training can happen around the house in the course of the day. Having two puppies complicates things. The outings will give you necessary opportunities to train the puppies away from each other.