Last weekend, my son Callum came home for a visit, and on Saturday morning, we had a breakfast picnic together at our local lake. After we’d eaten, we took Callum’s dog for a walk around the lake. It wasn’t a quick walk. Every few metres, we had to stop because people kept asking, “What breed is your dog?” Callum’s 5-month-old puppy, Crash, is a Great Dane/Stag Hound/Staffy cross. He has…