Good news! The dog found him!
It seems he was just walking out of a bush to bask when the dog found him. He started to play bow and bark (as he is trained to) when he finds a tortoise. Sunny is perfectly fine, but a little on the skinny side right now. I found him about 20 feet from his cage in some kind of long tropical grass. It is very close to the tortoise enclosure, and as we know, he attacks tortoises, so he must’ve seen them and attacked, then got bored. So happy!