This DevOps Reactions Tumblr is legit, yo.

http://devopsreactions.tumblr.com/

"I'm no corgi expert, but I read somewhere on /r/corgi last week that they tend do what some call "frapping." basically, they get an abundance of energy and just run in circles for a random amount of time. At some point, it ends, and its as if nothing happened."

Although yeah, this does look likes playing dead.

Here's an example:

Premature Celebration: http://pandawhale.com/post/21619/premature-celebration-gif

Super Mario Kart Cats: http://pandawhale.com/post/18581/super-mario-kart-cats

A Corgi training for the big race:

http://pandawhale.com/post/21789/a-corgi-running-training-for-the-big-race