I'd run the Demon Dog for 10 or more miles and then put her into some kind of contraption. So much depends on the attitude of the dog. The Demon is hyper and must have her "batteries" run down a bit....SQUIRREL! It also seems she is too heavy (23 pounds) and possibly too leggy for things. Think of a mish mash of hunting dog breeds of all sizes, with some terrier thrown in.