What do you think he is?

We got him believing he was a border collie, as he gets older he definitely doesn’t look full border collie. He’s only 8 months and weighs 19kg which I’ve been told is quite big for a border collie but vets say he’s at a very healthy weight for his height also.

I do think he looks bigger than a border collie and comparing him to full grim BCs I definitely think he’s big for his age. Some people say German shepherd x BC and some say Doberman x BC but I’m just not sure. We are wanting to do a DNA test when he’s older but I’m curious as to what you guys think he could be.