User blog comment:Mckrongs/Rust Duramboros Discussion/@comment-3133156-20111022150546/@comment-108.192.120.121-20111022224106

It's most likely covered with desert rock or other hard desert minerals. Its tail seems to be heavier and more powerful than your standard dobo, atleast. So we can probably take that as an educated guess and say the rest of it's body is slightly more well armored than a forest dobo.