Holger Schüler is one of the most well-known dog trainers in Germany. The dog training consultant is recognized by a wide audience through his television shows and stage performances. In his new book "Dog plus Dog," he focuses on multi-dog ownership, as having one, two, or even more dogs is becoming increasingly popular. In a practical manner and with his usual clear language, Holger Schüler explains what to consider before acquiring a second dog, highlights potential problems, and provides plenty of tips on how to ensure a smooth coexistence with multiple four-legged friends in the household.