How big is your dog? I could see either pointer or lab, especially if I imagine a chocolate or yellow lab. I would think the not liking treats would be an aussie thing, but maybe pointers aren't that big on them either. Labs, well, everybody says they'll eat anything. I think Aeress and gumby have good suggestions.
At the wonderful positive dog training class we just graduated from they recommended cutting up chicken hot dogs. It's more economical as well. You can get a pack of Gwaltney chicken franks for 99¢. Cut them lengthwise in 4 strips and then dice the strips. If you either microwave them on paper towels for 5 minutes or toast them in a toaster oven or conventional oven for a few minutes it dries them out and makes them less greasy. Still keep them in the fridge, but they'll last a long time.
He doesn't seem as boxy and bulky as a lab, but not as jowly and droopy as a pointer. Tough call. Coloring is right for a pointer and Aussie. I think I'm going with pointer, though.
I have a lab(?) coonhound mix. I know she's hound because she bays. She's sweet, but very scent driven. She's a dog's dog. She loves to play with other dogs and is super fluent in all the proper signals. My older dog (possible border/sheltie mix) is much more of a house/person dog. If I give them free access to the great outdoors my hound mix will be out there baying and digging holes and sniffing the breeze and my older dog will be right right here curled up on his bed unless he needs to do business or something really exciting is happening out there. Maybe you can make a more educated guess from his behavior and other characteristics like that.