How about Poochyena and Mightyena? I feel like, if given proper enrichment, they'd be good friends
The thing about poochyenas is that, essentially, they are just like dogs. Well-behaved dogs? Debateable. Easy to manage dogs? Maybe not. But they certainly aren’t dangerous to a disqualifying degree any more than a dog of the same size would. Let’s jump into it.
Poochyenas fit right into the perfect indoor pet range at just over a foot-and-a-half tall and weighing in at exactly thirty pounds. The pokédex doesn’t give us any indication that these pokémon have any particular environmental needs, which means accommodating one will be pretty easy, at least on the surface. There are two wrinkles to account for.
Firstly, a poochyena is going to need enough attention and space to play in order to get their energy out and keep their minds active. Wild poochyenas are hunters that enjoy chasing their prey (Ruby, Emerald, Diamond/Pearl/Platinum, HearGold/SoulSilver, Black/White, Black2/White2, X, Y, OmegaRuby, BrilliantDiamond/ShiningPearl, Violet), meaning they will need a lot of engaged, high energy play to stay happy and healthy. The other wrinkle is their biting and eating habits. According to the pokédex, an untrained poochyena is liable to “bite at anything that moves” (Ruby). Combine that with the fact that these omnivorous pokémon will eat anything they can get their hands on (Sapphire) and you have a serious need for training. Caring for a poochyena won’t always be easy, but it’s far from instantly deadly or completely unmanageable.
As I just said, these pokémon simply aren’t that dangerous, especially alone. They make act tough, making a habit of bearing their teeth, bristling their fur, and barking to intimidate foes (Sapphire, Emerald, AlphaSapphire, Scarlet), but they are actually quite cowardly, turning tail at the first sign of trouble (Scarlet, Violet). This means that an attack from a carefully trained poochyena isn’t very likely, and even so much as standing your ground (without hurting them, of course: I mean using a stern voice or standing tall) will probably be enough to deter them in most cases. Despite their scary-looking fangs, poochyenas can’t really do much to you besides using moves like Bite and Crunch which, sure, wouldn’t be good, but won’t be significantly more dangerous than a large dog. Again, their aggression is all show: I don’t really see much of a problem here so long as you spend time on training.
Given their size, pretty solid ease-of-care so long as you understand what you’re getting into, and their lack of real aggression, a poochyena would be a reasonably good pet. There’s easier options out there, but this might be one of the better Dark-Type picks available to the discerning adopter.