In The Same Room? What is This?

Bojack needs a place to stay when he gets out of prison so his enemy and best friend mr. Peanutbutter (doggy doggy what now?)welcomes him into his home. Trying to be a better person, Bojack learns to tolerate his canine companion and soon romance blossoms. Bojack Horseman and mr peanutbutter in the same ship? What is this a cross over fan fic?