A primary reinforcer is something that naturally gives pleasure or satisfies a basic need, like food, water, or warmth. It is a reward that our brains naturally find valuable. Full definition
etc) to be reinforcing if we pair this often enough with Primary Reinforcers (food, social interaction, play) during training. (boogiebt.com)
For cats who are picky eaters or aren't motivated by food, there are other activities that can double as primary reinforcers. (catster.com)
Food is the number one reward for many dogs (it is also one of the top primary reinforcers) and because it is powerful and rewarding for your dog, counter surfing will simply become one of his most powerfully self - driven actions. (training-your-dog-and-you.com)