I like that restraint Oli.
We bought one for Max that is a little longer than that one and has molle webbing and pouches, and some places for velcro patches if we wanted to use them.
He's so strong that we left the collar on and attached his leash there, and also to the front loop on his vest as a fail-safe in case he did manage to slip his collar. He hasn't yet and may never, but I've never seen him try to face down a big black bear either, so I don't know what he would do to be honest.
Plus, with all of the molle attachments and pouches that are on it, and with how strong he is, he can carry quite a bit of weight and take some of it off of me (us) while hiking.
Matter of fact, he hiked in and is camping with my middle son and a few of his buddies tonight. I know for certain that he carried the water and bunch of canned food at minimum.