To teach what not to chase, your pup must first be trained to leash walk nicely and to understand the "sit" and "stay" commands. These are essential in keeping your dog where you want it. Once those are mastered, your dog can learn not to chase. The goal is to expose your dog to staged situations that prompt chasing behavior, such as livestock or cars. Place your pup on a 6-foot leash and give the sit/stay command. Next, have a friend slowly ride a bicycle, drive a car, or jog by the pup, while you continue to enforce your puppy's sit/stay position. Distract your dog with a food reward, praising it for not chasing. As soon as it begins to agitate about running after, make an about-face and walk the other direction while praising and offering treats. Continue to Practice Gradually increase the speed of the passerby, and continue to intermittently reward your pup for sitting still as it approaches, and then turning away to get treats once it’s near. Drill with these setups over and over until the dog looks at you after he sees the passerby rather than wanting to approach and chase. Provide Safe Outlets for Chasing Give your puppy alternatives to satisfy this normal urge. Interactive games such as fetch alleviate the urge to chase and provide a bonding experience for the two of you. Reduce Opportunities for Chasing Enforce appropriate boundaries for your dog: A fenced yard or leash confinement when off your property teaches it the rules and prevents it from chasing livestock or other off-limits objects.