I made a dog toy for my dogs with a cheap lunge whip and an old stuffed squirrel toy. Remove the 8 inch popper from the end of the whip and tie on the squirrel and voila! If your dog has any prey drive at all, this can exercise them to exhaustion while you stand in one spot drinking a beer. My dogs' eyes light up when they see it. My terrier got out of the house, grabbed it from the garage and dragged it up to the front steps so I'd come out and whip it around for him. If you have a terrier who doesn't have the chance to hunt, this is the best thing you will ever do for him.