I just checked the dark heresy 2nd edition book for anything resembling the Badass robot dog in the arbites art, but there's nothing of the like in 2nd edition.

Is there something I'm missing? Or does anyone have a homebrew, our maybe just the stats and rules for them in 1e so i can figure something out for myself?

Thanks a ton.

Cyber mastiff shows up in DH1E adversaries section I believe.

Also has a whole section in Inquisitors handbook. Plus some Tech Preist familar stuff not limited to cyber dog (hawks, servo skulls, servitors ect.)