So.. we recently bought a tree thing for Noodle to hide in/climb on (Because he's a hardcore climber) and it's super wide and open at the base. However, I overlooked a hollow portion going up one of the branches and he sort of fits in it. I don't want him getting stuck, so is there anything I can fill that space with that won't hurt him? I'm loathe to take it out because he's loves the damn thing and is currently rubbing the rest of his shed off on one of the branches.
Any advice would be much appreciated!