“GSD in there somewhere...head tilt and eyes! Ear prick too!”
“I can see lab in the face and head shape but the ears say German shepherd to me”
GSD x is a common guess, the ear/s definitely suggest something like that in there somewhere, lol
He’s also a bit guardy of the house and has tried to herd people, so that’s why I think a chunk of something like that anyway if not GSD...
I see no lab at all tbh 
I mean, obviously nothing can be ruled out, rofl, but his coat is soft, there’s no outer hard layer, just short floof - also he has white patches, they don’t show up in photos, but I think the colour is from something else too and, he leaves half his food and literally the only thing he’ll accept as a reward outside is liver cake, so if there’s any lab in there, it’s well hidden, lol.
Also, his ears, head, body, tail and legs all clearly belong to different sized dogs 
I do joke quite a lot that he’s clearly made up of spare parts.
His brother looks like him, but black and with a rough coat and his two sisters are his colour, but with long coats. He’s the only one with an upright ear, lol. (They were all in the rescue together)
So assuming they all have the same father, that’s a right mixed bag of genetics there.