This is a crossover of My Little Pony: Friendship Is Magic and Underdog, where it's about the relationship between Rarity and Riff Raff. But can Rarity and Riff Raff's relationship still be together?

In this crossover with Underdog, Rocky and Bullwinkle team up with said superhero to take down the grandchild of one of his old villains, who in turn teamed up with Boris and Natasha.

Talking dogs should probably be the least of their worries, but, there you go.