Animal Companions are back in vogue, mythically. Krypto the Superdog has his own cartoon now, which also features Ace the Bathound (and his hilarious "utility collar").
Crazy though it sounds, I think Aquaman needs a dog as an Animal Companion; it's already been established that there are plenty of water-breathing dogs swimming around Sub Diego. I think "Salty the Seadog" (or, if you prefer Old School, "Topo" or "Tusky") would humanize Arthur greatly. Besides, the man lost his whole family; throw him a bone already and at least let him have a dog to keep him company, because talking to fish all day will drive you nuts.