You have no idea how happy this video makes me. A mere 6 months ago our pug Frank was an amorphous blob who did nothing but sit around the house and sulk. We thought he had a bad back and was in pain, but this spring our vet suspected it might actually be his thyroid. Sure enough, his levels were low, we put him on meds and now he's back to the old Frank. So happy to see him playing again.
BTW, Frank is the light-colored pug, you know, like Frank the Pug from Men in Black. :)