 It measures positive and negative emotional states in dogs. Optimistic dogs are more adventurous and persistent because they expect positive outcomes to result from their efforts. On the other hand, pessimistic dogs are more risk-averse and cautious, not expecting things to turn out their way. Kind of similar to people, so I guess it holds true. Dogs can be optimistic or pessimistic. Is your dog an optimist or a pessimist? Give me a call, 877-725-8255. But right now...