What are your thoughts?

We rescued this beautiful boy around three months ago. The rescue said he was a lab/staffy mix, but I’m curious about his ears and ridgeback?

He has the temperament of a staffy, very loving and sleepy. Doesn’t love food as much as I have seen labs do, but still loves it. He runs like a greyhound when he really gets going but doesn’t have a high amount of energy. He’s also quite lean but with a big staffy head.

Any thoughts?