One thing I learned in puppy class was chasing them makes them run. They think it's a game. Instead they encouraged us to try in a really high pitched excited voice "puppy! Puppy! Puppy!" I've never had the opportunity to try this out until I saw a Boston terrier in the middle of the highway. It's 50 mph here and he was just standing in the middle, frozen. I waited until the light turned and I did the high-pitched scream, as much excitement as I could muster! He came right to me. Not only did he come to me, he willingly jumped in my car.