prey drive......
it is just that. PREY (chase hunting object) desire.
It is the desire to chase and bite/get the prey object. That prey object could be a ball, rag, tug toy, sleeve, ANYTHING moving. In prey drive they have NO stress. It is the hunt and chase drive.
Some dogs have such high prey that they are mesmerized by the prey object even at a stand still. They WANT that object. BADDDDDDDD. Needless to say, you need high prey drive for your OB to look good. Focus is the goal.
With such a dog, withholding the reward (prey object) becomes the GREATEST punishment and you get a VERY focused animal with high intensity for the work.
Prey aggression takes it a bit further. It is the desire to FIGHT/KILL the prey object. Still in Prey Mode, but a lot more serious about the intent.
The dog either has prey drive or it does not. You can develop it to a small degree, but it is mostly genetic.
Working dogs have high prey, for the most part. That is why belgian malinois rule the dog sport/protection world. Off the charts prey.
Now here is a deadly combination............high prey driven dog with low nerve thereshhold. That is a danger to society and that is why most people underestimate their pooches. That is why nerves are soooo important in a pet.