And once again the internet has massively misinterpreted the signs of an animal in distress. This isn’t ‘dancing’, it’s verging on stereotypic behaviour; repetitive, unwavering actions with no meaning or purpose. These behaviours are only performed when the animal is frustrated with its environment, it’s essentially a coping mechanism.
Now this dog might be perfectly happy on a walk, but that pen is too small and too barren for the animal to be in for long periods, which it’s behaviour suggests it has.
I’ve seen quite a few videos now when people have filmed dogs bopping up and down, or hopping on their front legs and put it to music. In one case it was a severely arthritic animal trying to relieve pressure on it’s joints, and in this case it’s a dog trying to cope with an unstimulating environment.