Heck with the traction control, that seems to be a dead issue at the moment. Mods can split this out if easily enough.
I'm a smooth-coat border collie guy myself (Australian lineage, actually, and my whole reason for having the Tracker...I should post some pics of her setup in the back....water...food....tether....it's her mobile doghouse, she spends more time there than at home), but one of my best buddies has a champion bullmastiff. Dead ringer for yours, but he's up from his trim 135 to about 140 at this point. Helluva dog.