there isn't one
Athena's Bridle is part of the Atalante Pack. If you want Athena's Bridle you have to buy the pack, which costs 3 passes.
A western saddle and bridle. andalina
You can only sell the bridle it you haven't moved it to your tack room.
You have to hire a Saddler.
Buy them at the shop by clicking on the bridle tab when in the shop
A Bitless Bridle, (also known an a hackamore, or sometimes bosal for some people)
Athena's Bridle
Yes, you do. And a bridle and horseshoes if you want to enter a competition too.
You have to hire a saddler for a saddle and bridle, and a farrier for horseshoes.
Bridle path
For Howrse: a bitless bridle. Here's the site I found it from =) http://www.padd-horsetack.com/riding_shop_Z00714.htm
Howrse no longer does codes.