They’re the subject of videos and photos all over the internet. Bounding down the trail, tails wagging, tongues and ears flapping—not a care in the world. I’m talking about a mountain bike trail dog and they’ve worked their way into mountain bike culture, becoming favourites on social media and at trailheads alike. And it’s no wonder. Dogs and humans have a special relationship. We’ve relied on dogs for thousands of years to help us hunt, haul supplies, and everything in between. They’re called our best friend for a reason, and that notion applies to mountain biking as much as any other job or activity. They’re called our best friend for…