Harnesses are fine to use. You can buy one at a store or make one yourself. OgleRpets on this site also makes them and sells them to fit.
I never ever leave the house without mine wearing her harness and leash, Theyll just all of a sudden "JUMP" and the leash can prevent injury. Also if outside if theyre startled, they could bolt and run and get lost, leashes solve this issue also
Definately the 1 thing i can not be without, safety for my beardie comes 1st