Q: Buster, our American bulldog, used to love his walks. Now it’s a miracle if he makes it around the block in half an hour. He’s not overweight and he’s on medications for arthritis, which have helped a lot, but it looks like it might be time to stop walking him. My husband disagrees. He thinks Buster should be walked anyway. He says all dogs benefit from walks, regardless of their condition. Is this true?