Something which the dog inherently likes; examples might include food, opportunity to play with a toy or the opportunity to jump up on you.
A reinforcing event that does not depend on learning or previous experience to achieve its reinforcing properties (e.g. biological need: food, water, sex).
in operant conditioning, an unlearned reinforcer, which satisfies a biological need such as air, food, or water. (246)
Reward that gratifies biological needs or drives.