When our large puppy went to a neighborhood dog’s birthday party, I was worried. Our dog is 85 pounds and 18 months old. He is friendly and rambunctious. There were kids and dogs of all sizes running around and I was prepared for the worst. My assumption was that, off-leash, he would be romping everywhere and getting his big body into all sorts of trouble. But my assumption turned out to be wrong. I almost didn’t go to the party, which would have deprived both me and our dog of a terrific night.