To stop dog chasing, know your dog’s triggers, trust your dog’s restraint, train your dog to stop bad behavior, and reward him when he gets it right.
Start by determining your dog’s prey drive. Dogs with a high prey drive are more likely to chase.
Break a bad habit
If your dog is chasing things, it can be a hard habit to break.
Eliminate dog chasing lures
Start by reducing your dog’s exposure to chasing triggers like joggers, cats, rabbits, bikes, or cars.
Teach your dog to stop
Set up an indoor training session using a confined space. Put your dog on a leash, then roll a tennis ball for your dog. If your dog starts to chase after the ball, tug on the leash and give your dog an “off” or “stop” command. Do not release your dog.
Repeat the training until your dog will relax and not chase the ball. Be sure to reward your dog.
Practice, practice, practice
Keep practicing and work up to having someone pose as a jogger, or a cyclist, or whatever your dog has been chasing.
Start by having your dog on a leash and giving the off command.
Then work up to training with your dog off-leash.