Hello and welcome. This is just a short note to introduce myself or to request needed information for your problem. My name is ***** ***** I have been in the dog field for 25 years. I am a Therapy Dog & AKC Evaluator/trainer/ as well as an assistance/service dog trainer, specializing in behavior. It will be my pleasure to help you today.
When a dog has an unhealthy attachment to something it is time to take it away and introduce other mind stimulating toys. There are a variety of dog puzzles available to try.
Playing with a ball can be good physical activity but does nothing to stimulate the mind. You have a breed that has a need to hunt vermin and that mind needs to be activated the right way which may include toys that move or are interactive in other ways .
I would also do daily positive obedience training with the dog several times a day. You want to teach the dog to wait for things as it sounds like there is poor impulse control, you want to teach leave it so the dog is not just sniffing whatever it wants to.
I am going to direct you a link to take you through training in a positive way. Eventually once training is underway you can try to introduce the ball again to gauge the impulse control.
Clicker training/positive method training/ print off
video’s to see how clicker training is done, scroll down to videos http://www.clickertrainusa.com/clicker-training-videos.htm
clicker maintaining focus http://www.clickertraining.com/files/auto-eye-contact.pdf