I now have this headcanon that Jason has had this secret (obsession) desire with getting a puppy. Or a dog. Or any kind of pet, since he was ten years old and never got to have one. And it only got worse when he saw Reyna's dogs (even though they werent actual dogs) but he still never said anything and just kinda longes from a distance. But anytime he tried to get a puppy of his own, something always got in the way like rules or training, or being the leader of his camp, or having his memories wiped, or saving the world. You know small stuff. Finally after the war against Gaea is over he finds a fucking Great Dane while he was out and his old longing comes back full force and he refuses to be parted with the she dog he has named Sea Biscuit. Piper tries to tall some sense into him about the rules and how it's a fucking huge ass dog but Jason literally becomes an uncompromising child and won't be parted with Sea Biscuit. Not even Chiron, Reyna, or Mr. D can stop him so they all just let it be. And with the amount of time he spends doting on her and grooming her and playing with her (and having the occasional 'whose pet is better' competition with Percy) Piper, despite herself, is getting jealous that she's losing to a dog. Now whenever Jason isn't looking she has this like stare down with the dog like 'I was here first'. Which she always loses because goddamn even huge ass dogs have puppy dog eyes more powerful than charm speak.