Since you asked, it's because the dance button requires some JavaScript that is included on each page as part of the site layout. However, user profiles are missing this JavaScript since they don't use the same layout as the rest of the site.

I will see if I can fix this soon :)

In the meantime, you can workaround this by putting the dance sCode somewhere else, such as a pet profile, the notepad widget in your sidebar, comments on each other's profiles, or a post in a private forum group.

This should be working correctly now! :)

[edit] If it doesn't, try clearing your browser cache to make sure you're getting the latest updates to our Javascript.