Article: Psychophysiological mechanisms underlying the potential health benefits of human-dog interactions: A systematic literature review.

1. A description of the claim: a. What is the claim? b. Is it frequency/intensity, association, or causal? 2. A description of the method (how did they collect data). 3. Description of the validity issues in the study. How does the study stack up for each of these? a. Internal (Are there problems? What are they? How do they relate to the claim?) b. External (To whom do they want to generalize? Are there problems?)