Drive and arousal are not the same
Drive is a dog's desire to work toward something, like chasing, tugging, or hunting. Arousal is how revved up the body is right now. A dog can have high drive and low arousal, or the other way around. The best search dogs have the first without too much of the second.
That matters because a wired dog searches badly. They rush, skip over the odor, and wear themselves out. A calmer dog with the same drive does careful work. Our page on arousal vs. excitement goes into the difference.
So the aim with a high drive dog is not just to burn off energy. It is to teach the dog to turn the energy into patient searching.