In behavior science, reinforcement is an outcome that makes a behavior more likely to happen again. The word describes an effect on behavior, not what a person intended.

If a dog sits, gets food, and begins sitting more often in similar situations, the food may be reinforcing the sit. If the behavior doesn’t increase, the food may have been enjoyable, but it didn’t reinforce that behavior in that situation.

What does positive mean?

“Positive reinforcement” combines two technical terms. Positive means something is added. Reinforcement means the behavior becomes more likely in the future. So positive reinforcement means adding something after a behavior, followed by an increase in that behavior.

“Positive” doesn’t mean good, and “negative” doesn’t mean bad; those words describe what changes in the situation. In this terminology, negative means something is removed.

What can reinforce behavior?

Food can reinforce behavior for many dogs. Other outcomes might include access to sniffing, play, movement, attention, or distance from something uncomfortable. What matters is whether that outcome affects what the dog does in similar situations later.

The same outcome can matter in one moment and not another. A dog who happily takes food at home may ignore it outside. That could relate to the food, the surroundings, the dog’s state, or the difficulty of the task. We need to look at the whole situation.

Watch what happens over time

To understand whether something is reinforcing a behavior, notice what the dog does in later, similar situations. Did the behavior become more frequent, last longer, or happen more quickly? If not, consider whether the consequence mattered to the dog, whether the situation was too difficult, or whether other events affected the response.

Reinforcement helps us ask a useful question: what happens after the behavior, and does that outcome make it more likely next time?