Little King Trashmouth and His Husband Gary (Patreon)

Finito~

Catfolk and Diamond Dogs have been mortal enemies since the dawn of time, but Capper and Fido hit it off big one night at the Grand Galloping Gala. Capper, delighted to meet another individual who'd also attempted to enslave ponies for personal profit, playfully teased more and more stories of criminality and dubious ethics out of the shy, gentlemanly dog. They met up again after that night, forming a business partnership in the excavation and smuggling of rare gems....and maybe, just maybe learning that the true gem was right in front of them all along~

Jk. More realistically is that Capper really, really likes being showered with attention and adoration, and there's no one more willing to do that than a dog. Capper, charismatic playboy that he is, still finds himself surprised and flustered at Fido's more earnest, sweet gestures of affection, be it bringing Cap a bouquet of daisies, or stealing a necklace Capper mentioned liking. Capper calls him "Fifi"~