This article provides a review of research published since 1990 on the effects of music on the behavior of animal like as pet music therapy. Music has many positive effects in reducing anxiety and stress before and after procedures in medical settings, and can influence a person’s feelings. Research involving music suggests animals may be similarly affected; classical music induced more relaxed and desirable behaviors in dogs housed in shelters, compared to other music. The healing power of music has long been established in people. Now a handful of harpists throughout the country are harnessing that power for animals. Classical music resulted in dogs spending more of their time resting than any of the other experimental conditions of auditory stimulation. This type of music also resulted in a significantly lower level of barking. Research suggests that calming music may have a beneficial effect on humans, resulting in diminished agitation, improved mood and lower levels of stress. Although the specific effect of classical music on animals remains unknown, the findings from this study suggest that it may, as in humans, have a calming influence