He goes. Always. I don't make exceptions if he's already on the trip with me. Now, if I have someone else along, then I might have them watch him. I'd just rather he come along. He does well when we go out hiking. I have yet to take him on the trail while I'm on my bike, but he does tend to stick by me when we've tooled around the block. He has the potential to be a trail dog, so with some training and exposure, I'm sure he'd do just fine.What if you have to leave your dog while your on the trail either hiking or biking? What do you do?