My friend used to have a mid-sized mongrel who used to crack me up, rather than cutting corners like most dogs do he would rail the berm if there was one, it was like watching a luge! 10 years on I still think about Ghengis every time I go round a certain couple of berms at GT, still brings a smile to my face (the two before the boardwalk on magic Mushroom).
My dog is great at running with the bike, he loves the tight steep twisty DH we have round here rather than having to run flat out round GT or Innerleithen XC, not fair when you can do (guess) 30mph off the minchmoor without peddling and he’s having to burst a gut to keep up, dogs don’t have freewheels! He keeps tight to the back wheel of whoever is in the lead and never gets in the way, he’s only little and is great to watch, totally committed!