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Flexible Filly Muzzle Instructions

What is included in the muzzle package:

  1. muzzle
  2. pack of bread ties for fitting muzzle
  3. pack of low profile zip ties with a few extra

What you will need:

  1. Halter: We recommend you commit a dedicated well-fitting breakaway turnout halter with a fairly sturdy noseband to your muzzle.
  2. Time: It generally takes about 10 minutes to get everything fitted the first time you apply a Flexible Filly Muzzle. Subsequent muzzles will take about 3 minutes.

How to begin:

grazing muzzle fit instructions

Unpack your new muzzle. Fit your halter to your horse. Take a piece of bailing twine, string or other flexible material, run it from the bottom of the halter square ring, across the horses’ lips (just touching) to the bottom of the square ring on the opposite side. Mark or cut your string. Place the string on the portion of the muzzle with the triangle cutouts. Place the middle of the string across the middle of the circular hole. Find the holes that are closest to the ends of your string. These will be the holes you use for the correct fit.


Use the enclosed paper ties as a temporary tool to affix the square ring to the Flexible Filly by placing the selected hole slightly underneath the bottom of the ring. Then tie the paper tie around the ring using the hole above. Repeat this process for all 7 other fins, keeping the selected hole below the part you are affixing it to and using the next open hole above it to tie the paper ties together. This allows you to easily adjust the fit before securing with the permanent cable ties. Once you are satisfied you have the correct holes aligned to the halter please remove the paper ties or string and permanently secure the muzzle with the included cable ties.

How to orient the muzzle:

Two of the “fins” have a triangle cut out. These attach to the square (side) rings on your turnout halter and should be fastened one or two holes shorter than the front and rear sets of fins. Three front fins will connect to the nose-band, one in the center, the other two fall naturally to the sides of the center. Three rear fins will connect to the chin band. Connect one in the center of the chin band (do not use the ring). The other two connect naturally to the sides of the center.

Securing the muzzle:

Secure each fin by inserting the cable tie through one hole, up around the nose-band then through a second hole.  When attached to a halter with a sturdy noseband, properly fitted with the excess fin material trimmed close and cable ties pulled snug, the muzzle will not rub.  Please do not wrap the fins around the halter. After finding the best fit for your horse, simply trim the excess fin material just above the top hole being used. The “keeper” on the cable tie is on the outside of the muzzle and the excess is facing down and trimmed close.  You will receive extra cable ties so you will have a few spare ones.




When properly installed, the muzzle should be close to but not touching the nose of the horse. If the muzzle is touching the nose simply make the fins under the chin longer, this will lift the muzzle away from the nose. The muzzle should be less than one finger distance from their lips –  see the silly pony, is it close enough to stick a tongue through?


  1. If the horse is eating out of the sides (not using the center hole) check the following. Be sure your fins are snugly secured to your halter.   If the problem persists check that the noseband of the halter is not too loose and the muzzle is close to the horses lips.   Solutions, try making the fins with the triangle cut outs one to two holes shorter than the other fins. The remaining fins; front and chin are centered and then the four other fins are allowed to fall naturally, by design, next to the center fins.
  2. Breaking Zip Ties.  The enclosed zip ties are designed to break before the muzzle tears. We feel the safety of the horse comes first, the longevity of the product second, and the hassle of finding a muzzle third.  If you want to ensure the cable ties will not break you may purchase stronger zip ties or double up. Please be advised when increasing the strength of the cable ties, tearing of the muzzle is not warrantied.
  3. Don’t forget, you can also shorten and lengthen the fit by adjusting the halter itself.
  4. Call Flex if you need help. 888-401-9101.