All dogs have some level of prey drive, the motivation to chase, catch, kill and consume, with hunting and killing being a means of survival. This behaviour is not emotionally driven but a genetic predatory response, the dog perpetrating the chase is neither vicious, malicious or vindictive but fulfilling a primal instinctive need. Dogs find it reinforcing to chase. Working, hunting and herding breeds have a higher chase drive instinct. Aside from a chase drive, not all dogs will necessarily be motivated to the kill. You need to teach your dog activities that challenge their senses and, also, the medium of self-control.