Dog puppies have always been important companions for humans and have become immensely important over the course of time. They are not only loyal companions and popular pets, but also fulfill a variety of other roles, such as hunting dogs, rescue dogs or guide dogs. The close relationship between humans and dogs goes back several millennia. Even in the Stone Age, dogs were used for hunting and as guard animals. Over the course of time, the tasks of dogs have become increasingly diversified and different breeds with different abilities and characteristics have emerged. Puppies are usually the first contact people make with dogs. The process of dog training often begins in puppyhood and is an important part of the relationship between humans and dogs.