Experts will come... but for me, the non expert, when I have a ball, Titan will literally do anything he needs to to get that ball, and he never ever stops at it until he's told to, that IME is high drive. He didn't have a food drive when he was growing up.. but now we found the treat of his dreams and he will now work for treats if need be.. so I would say he had a low food drive.
These should come naturally.. as far as I know.
Commander Charly Titan (GSD)-15 Jan 2010
Lady Athena (BB)-2011-2012 (RIP baby girl)