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.