There was only one animal possibly worth considering at Duel Academia. And that was Pharaoh, Daitokuji-sensei's cat.
Technically speaking of course, he was the only proper animal on the Island.
But still, he was special. None of Daitokuji-sensei's classes would have been complete without Pharaoh there. Several times, Pharaoh had played a key part in the lesson (if only having to be rescued)
Sometimes Pharaoh had gotten lost, but all the Osiris students had always found him again.
The Osiris students helped, not only because they had been told to, but because they believed that Pharaoh was the best cat ever!