Do they serve any purpose other than being "attack" dogs? In the video you will notice how the decoy is still standing upright and moving around fairly well, that is very atypical of an American dog hit.
The battalion these dogs are attached to is mostly serve to to conduct safety at chemically hazardous production facilities in the Volga Federal District, anti-riot activities, and supplying reinforcement to local and federal law agencies. Unfortunately, I'm not pretty witty to comment om their activity (I only got a Caucasian shepherd dog to protect my house). Yet, the handlers say these animal are really something and they're happy to work with them, I don't think they are going to tell the untruth.
Hakkaa päälle, Pohjan Poika!