I tamed one of these in my most recent Dark Heresy adventure so I obviously need to make one for our games (it was represented by some random monster model).
I waivered between a few models to use for the beast including a Jaws of the Deep from Hell Dorado, Fenrisian Wolves and Chaos Warhounds. The Jaws of the Deep looked awesome but I really couldn't wait a month for it to arrive by post and the price tag was a bit high for a model that might take a lascannon in-game and be gone forever. The wolves are nice but look too wolfy so I went with the warhound which has quite a lot of spikes and looks far more menacing. I finished assembly and greenstuffing it last night and hope to start painting right away.
Brand had previously learned the basics of wrangling on a feral world where transport required the riding of dust dogs. Although not an expert Brand quickly caught on and understood the principles easily enough.
Later, after escaping from the gladiator pits of some unknown world Brand calmed and befriended a rampant grox-like animal. With this new found confidence Brand unleashed the caged 'prizes' on their unsuspecting captors. One of the caged animals was a Cruorian Warbeast. After slaying 2 of its captors the beast turned on Brand who quickly dodged and soothed the animal.
"I will name him Spike" Brand said calmly to his cohorts as the Warbeast looked at him in appreciation, a glint of intelligence apparent in its eyes. Spike quickly followed them to the elevator out of the dungeon.