Start slowly. You wouldn’t attempt a 10-mile hike the first time out; neither should your dog. Also, consider your pooch’s suitability: Breeds with short noses such as bulldogs and pugs overheat easily so they’re not the best hiking buddies. Small dogs can hike but need help around obstacles. Senior dogs may not be as spry as they once were, so plan shorter trips. Ditto for overweight dogs. Don’t forget to bring water and snacks for both of you.