Same way you can trap a person's foot and yank them off balance if they try to trip you. Of course, dragons are more stable than bipeds, but that's why they get the quadruped bonus (EDIT: Heh, Togo had a better answer here And Togo, sorry if this was stepping on your toes, I wasn't sure when you'd have a chance to reply and all the rules involved seemed pretty unambiguous, so I thought I'd try to clarify.)While RAW, how do you trip a dragon with his own tail?
When making a trip attempt, you give up your standard damage (unless you have something like the wolf's special Trip ability); you're trying to unbalance them, not hit them at full force. On the upside, you get to make a touch attack rather than a regular melee attack. If you have the Improved Trip feat, you get a free normal attack if you successfully trip them.No, but it'd do tail slap damage.
Honestly, I suspect Xiuhcoatl will be most effective in melee combat just unleashing horrible Godot-buffed full attacks on things
If anyone has buffing requests, please let me know, I'll be adjusting my spell list for the day in the next few hours.