Mawg is the name Dorrin gave the huge brown bear he rescued from a troglodyte animal pen in the Glitterhame. The animal had been treated cruelly by its reptilian masters, and was used to attack trespassers, but Dorrin was savvy enough with wild animals to be able to calm it and set it free.
The bear followed him in a friendly enough way for a little while, until being scared off by an encounter with foul undead at Thunder Tor.
Dorrin later tracked it down in the wilds near Firetop and rescued it from a band of hobgoblins that were trying to disturb its hibernation, and since then, has looked after the bear first as a pet, then a friend and now also a mount. Having trained the bear to carry him into battle, he has also had a set of chain barding made for him, and the two together are formidable indeed.