I mean in a future update, he can allow the player to remove any of the pets at your home and replace them with a different one if you run out of rooms for them, the ones that have been removed can be regained the same way as when you first got them if the player changes his/her mind.
I understand but the only way for that to work if the way you get them in a chance encounter is if that encounter can be repeated. If you can obtain by taming the creature then yes that makes perfect sense however like with the horses that's a chance encounter and the guy says the rest he'll deal with. Meaning there gone hyao would have to come up with something to counter this like idk maybe they release the horses and they come to your house and you can take one? Or you can buy the new horse and sell the old one to the shop dude that's on the road.