He's my dog and he rides with me all the time, he's about 5 1/2 now and pretty much at the peak of his powers as a Trail Dog.
Top speed is about 25mph in bursts but it's in the twisties that he excels, he would be much quicker than most riders on singletrack but he's trained to never come up on the front wheel.

And he can jump!

But he can also be a total twat on times, ask anyone who knows him, obsessive beyond belief with: sticks, fires, cats, mice and mostly....Mountain Bikers.

 the dog went bigger than the rider! Awesome haha

 I think its gunna case

 hahah sick shot, my dog does that on the trail i've been building.. if he see's a pheasant he sprits down the trail and actually does the jumps aha he's rapid. POD

 Scrub much

 your dog has supermans dialled

 Look at that extension!

 i spot a spinergy front wheel ..

 sick shot!

 I want a fucking dog!

 Do a back flip

 TRAIL DOG!!

 dogs showin you up lolz