FUN or RUN?

Watch the video below I recorded during one of my walks with Molly and try to answear the question: Are these 2 dogs playing ?

https://video.wixstatic.com/video/634f46_d47efc2b21aa4390919e7cd703d4f9db/1080p/mp4/file.mp4

If you have your answear already, watch the video with my detailed explanation to see if you're right:

https://video.wixstatic.com/video/634f46_d6369f17427b4428bada754327f8fdd3/1080p/mp4/file.mp4