If inflated it will take 400 % more darts/bullets hits ect. To knock it out / kill it so dododex is not wrong it's just because the gas bag is inflated. Also bring cryppded anky or magmasaur with pick or minding drill to collect a huge amount of metal! While rideing of course because it has a ton of weight.
They are believed to be part of the Tardigrada phylum, a group of extremophile microgranisims that can survive literally any environment, from extreme cold to extreme radiation, these guys are the hardiest of animals.