not rottie mate, but seen a Bel Mali, the other day a bloke trains them for the cops, not over big 26 in 70 odd lb, but bloody hell very full on+very strong pull bloke down easy, Spoke the fella , and said power when it hits the sleeve, if on the street would feck your arm real bad. Very good guard prob better than a gsd .
i have a gsd and a mali the mali has twice the drive of the gsd but its very easy to over cook them.