Rin is terrible at it. He does not have a lot of experience with domestic animals and isn’t really sure what to do with them, and also his frequent brushes with the Void may have left him with a slightly distasteful resonance to the natural beasts of the world. Even his carbuncles are on the willful side, frequently slipping out of his control and causing mischief if his concentration lapses. His chocobo is stolen, poorly trained for carrying a rider, and aggressive, and even though he is fond of it in a weird way he is not really well versed in chocobo care so it’s probably not the happiest bird in the world. At the moment he also has a pet peacock (which was also stolen?? goddamn), but peacocks are notorious for eating virtually anything and it was previously kept in a tiny cage in an aristocrat’s parlor, so it’s generally all right at the moment.