Portuguese Water Dog for everyone. Because of their intelligence and working drive, they require regular intensive exercise as well as mental challenges. They are gentle and patient — but not "couch potatoes", and boredom can cause them to become destructive. One theory proposes that some of the dogs left the Asian steppes with the Goths, a confederation of German tribes. Some, (the Ostrogoths), went west and their dogs became the German poodle, called in German the poodle-hund or puddle-dog—that is, water-dog. Others, the Visigoths, went south to fight the Romans, and their dogs became the Lion Dog, groomed in the traditional lion cut.
Jackal–dog hybrid problems, as well as an increase of genetic diseases after three generations of interbreeding between the hybrids, unlike with wolfdogs, which remain healthy and never become sterile. These "puchas" (poodle-jackals), like the "pucos" (poodle coyotes), exhibited much less domestic dog-like behaviour than the wolf-hybrids. During 1975, scientists at Russia's DS Likhachev Scientific Research Institute for Cultural Heritage and Environmental Protection began a breeding project in which they crossed golden jackals with huskies, to create an improved breed with the jackal's power of scent and the husky's resistance to cold. During recent years, Aeroflot has used one-quarter jackal hybrids, known as