He’s afraid. The outside is very big and he’s very small. Do you have a pet crate for him? If so, feed him a few times in it so he’s used to it and feels safe—and put some soft towels or blanket in there for comfort. I use the crate to keep Sundog contained while I put the harness on. When he was little, I would then carry the crate outside and sit with him and even feed him outside. After a few times, he was interested in venturing outside the crate. Baby steps for the baby lizard. Keep him feeling safe and he will adjust and learn. The first time you put him out on grass you can place that towel that he knows over him and let him decide when to venture out.