Hi I posted a thread a few months back asking what breed this dog is... I now have new pictures of him fuller and healthier it might help you guys help me figure out what breed he might be.
The first pic had me thinking Bullmastiff/Lab mix. But looking at the pics of him with the kids, I'm leaning towards Boxer/Lab because of his size. He's a gorgeous dog whatever he is!
due to the obvious mild undershot i'd say both parent breeds carried the trait so not likely a labXboxer F1 (very popular pig dog in NZ and almost none i've seen pics of had any degree of undershot). the drop in the jaw is also a featur primarily of the boxer but does show up somewhat in other excessively undershot breeds like bullmastiff and johnson & alapaha bulldogs. my best guess would be a tall skinny narrow chested boxer X bullmastiff or a very lean athletic looking pure bullmastiff.
He has quite a thick neck and front but is slimish at the back, but I think that is due to his lack of muscle tone in his legs as he has had a broken leg in the past and is still not putting full pressure on it.
do Boerboels have an under-bite? he looks a bit like some of them when I google the breed, but they look too drooly looking for what he is. and they seem to have a fuller face, he has a large head but his jaw is quite slim.