Which of the following is an example of an environmental reinforcer?

• A. Food delivered after the behavior
• B. A decorative bell rung to signal reward
• C. Voice praise from the trainer
• D. Access to a favorite toy left in the environment

Answer: (D)

An environmental reinforcer is something already present in the dog’s surroundings that can be accessed as a reward after the dog performs the desired behavior. It reinforces the behavior by being readily available in the environment, so the dog doesn’t have to wait for the trainer to hand something to them.

A favorite toy left in the environment fits this perfectly: after the behavior, the dog can immediately access and play with the toy that’s already there. The reward is part of the surroundings, not something the trainer must deliver each time.

Other options don’t fit this idea. Food delivered after the behavior is a primary reinforcer but is given by the trainer, not something already in the environment. A decorative bell rung to signal reward is a cue that indicates a reward is available rather than the reward itself. Voice praise from the trainer is a social reinforcement provided directly by the trainer, not an environmental reward.