Firstly: the Border Collie, which is gentle and has a very high IQ. Second: the German Shepherd, a training breed that learns quickly. Third: Golden Retriever, also a working breed, with a strong IQ and face. Fourth: Doberman, a specialised working dog for the army with a very high IQ. Fifth: Labrador, don’t look silly, but learn without any doubt, guide, search and rescue, etc.
