The second video is of a woman and her dog who regularly enter competitions for dancing with your dogs. I saw a news segment or part of a documentary about the sport and those people practice with their dogs on a daily basis year round so it’s more than a matter of how long it takes to initially train the dog for this. Evidently it requires daily upkeep and practice.
If you want to see another great dog act (not specifically only dancing) check out the entrants in this year’s AGT, Olate Dogs. It’s clear how much this family loves and is devoted to their dogs. And the dogs are having a ball and thoroughly enjoying themselves.
(I have no idea how you train a dog to do backflips but these guys did) really impressive. And most of them are rescued shelter dogs. Very inspiring.
Olate Dogs. Check them out.
I hope they win.