No two mixed-breed dogs are exactly alike, which is part of what makes them special. July 31 is National Mutt Day, a day that celebrates mixed-breed dogs and encourages people to adopt them from shelters and rescue. About 75% of dogs in shelters are mixed breeds, making them the largest group of dogs waiting for homes. One of those dogs was Major Beans. Major Beans was waiting for a home when someone decided to adopt him. After his adoption, he became known online for his playful behavior and…