Cheese Dragons are not actually alive. They are enchanted items of food that act almost identically to dragons. They have no need to eat, but they must “live” in humid environments or they will dry out and harden.

Being what Yuuuno is, cheese, no one is really quite sure if they should pet it without making their hands smell like mozzarella. But other dragons, at least, don't seem to mind. Yuuuno is often targeted for snuggling sessions, especially on rainy days. Smaller dragons gladly hide under its wings to function as an umbrella; because cheese, as far as many creatures know, hopefully is not sensitive to feeling rain, of all things.

..Although.. No one seems to notice the prominent looking holes on its wings.