This valley in particular is very conscientious of exercising our dogs. In fact, many times we over exercise our dogs, particularly puppies. I was told by my vet back in the early 90’s that puppies should not be taken farther than one mile a day until they are over a year old. Why? A 17 24puppy’s joints are not even close to being developed at that point, and over-exercise can damage that growing joint. That can contribute to lameness and even poor joint development. We love taking our pups with us on wonderful hikes, especially here where there are so many wonderful places to go! I am not a veterinarian, but puppy and dog health is a huge part of dog training. A dog or puppy that is in pain will inhibit the dog’s ability to learn and can contribute to behavior problems. Another note is that dogs will not show their pain until it is very severe. I urge you to consult your own veterinarian about how far your young dog or puppy should go.