My Little Pony: Friendship Is Magic #82

Plot

"A dust-up in Ponyville plus an escaped Cerberus equals quite the ruckus for our favorite fillies! When Princess Celestia requests a dog sitter for the high-spirited canine, the task falls to the least-likely of ponies: Rarity! It's going to take some dog-dog-dogged determination, a bit of hard work, and a whole lot of patience to figure this whole dog thing out... but it's sure to be a pawsitively wild adventure!"