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Flexible Filly Slow Feed Grazing Muzzle

(8 customer reviews)


The Flexible Filly Slow Feed Grazing Muzzle is unlike the typical heavy, hard, and “cage-like” apparatus. The design has been completely rethought to be softer, lighter and less confining. Constructed of a pliable material that reduces the chances of the muzzle getting snagged, it is also soft on equine teeth and lips. The Flexible Filly Slow Feed Grazing Muzzle is well-ventilated and safe, rated to break just before your leather turnout halter.

The muzzle is made from one of the most durable polymers on the planet, fungal/mould/UV resistant. Don’t let all that simplicity get in the way. It has taken years to get the right materials to work this well! It is safe, effective and durable. The muzzle is ideal for slowing down speedy eaters, limiting grazing, and can help curb minor cribbing problems. The muzzle can also keep horses from chewing on leg wraps, wood, or blankets. It works extremely well with all automatic waterers and has UV protection which works much like sunscreen for those delicate noses.

Equine grazing muzzle centre hole sizes.

All muzzles have a 2cm opening which can be adjusted as below;

Veterinary Recommendations for grazing muzzles hole sizes are as follows.

24/7 Full time grazing in a muzzle; 3.5 to 4 cm.

Restricted grazing; for horses who require substantially less sugar intake; 2 to 2.5 cm.

The Flexible filly equine grazing muzzle hole size is, you guessed it! Flexible!

The good news is, the flexible filly grazing muzzle limited hole size can be easily altered by horse owners for the perfect grazing opening. ThinLine will be making all their muzzles with a 2 cm hole in 2020. To create a larger hole simply mark your muzzle with a pen and use a pair of scissors to cut the size you need.

Because every horses’ needs are different we offer you a fully customizable grazing hole for your equine muzzle. It is easy to have not only extraordinary comfort for your horse but also the perfect grazing hole size for all metabolic and environmental issues.

Please note – the ties that come with this halter are specially designed to break if there is any pressure on the halter – replacement ties can be found here if you need to refit the halter onto a different horse or pony.



Flexible Filly Slow Feed Grazing Muzzle

Available in three sizes. There is so much flexibility in this horse grazing muzzle it will fit a variety of horses.

Mini to small pony: Order the 23″ size; small.

Pony, cob or Arabian: Order the 24″ size; medium.

Horse Sizing: 24″ or 25″ Follow guideline below

  • My Horse sized halter fits when at the middle hole or above, order the 24″.
  • My Horse size halter fits at the bottom hole or two, order the 25″. If you are on the fence, always order DOWN to the smaller size.

Draft or Oversize: Order the 25″; large.


Applying your new muzzle.

What you will need:

  1. Halter: We recommend you commit a dedicated well fitting breakaway turnout halter to your muzzle.
  2. 10 Minutes: It generally takes about 10 minutes to get everything perfect the first time you install a Flexible Filly Slow Feed Grazing Muzzle. Subsequent halters will take about 3 minutes.

How to begin:

Use the enclosed paper ties or a string to discover the best holes to secure your muzzle to your halter. The paper ties are a temporary tool allowing you to easily adjust the fit.

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. Three fins will connect to the nose band, one in the center, the other two fall naturally to the sides of center. Three fins will connect to the chin band; one in the center, two naturally to the sides of the center. (see image below).

Securing the muzzle:

First secure each triangle cut out fin with one of the enclosed low profile cable ties. Do not wrap the fins around the halter, doing so may cause rubs.

After finding the best fit for your horse, simply trim the excess fin material just above the top hole being used. It is fine to wait a day or two to ensure your muzzle is a comfortable distance from your horse’s mouth prior to trimming.

How the proper fit looks:

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 “keeper” on the cable tie are on the outside of the muzzle and the excess is facing down and trimmed close.

If you find there is too much grazing room be sure your fins are snugly secured to your halter. The fins should not move along the nose band. If it does simply pull the cable tie tighter.

Flexible filly grazing muzzle fitting guide


Returns and Warranty Information?

Flexible Filly Slow Feed Grazing Muzzles come with a full 6-month product replacement warranty.

Before you return, please email 2 photos of your horse wearing the muzzle. One grazing and one not grazing. Please send to This way we can make sure it is fitting properly and offer guidance if needed.

**It is our experience this muzzle works on every horse when you have the correct size and it is fitted properly and secured. We are here to help you become accustomed to this new patented design**



Additional information

Weight N/A

Small 23", Medium 24", Large 25"

8 reviews for Flexible Filly Slow Feed Grazing Muzzle

  1. Alex R. (verified owner)

    Absolutely brilliant product. No rubs or sores with this Grazing Muzzle and does a super job and restricting intake. Very pleased, will buy again when this one wears out.

  2. Anonymous (verified owner)

    Great muzzles, am using them on 2 of mine and they are the only ones I’ve found which don’t rub and the horses don’t make any attempt to get off. Slight issue with the size of the holes which allow grass through but other than that they are exceptional.

  3. Judi Wrighting (verified owner)

    Really pleased so much kinder to my horse than other grazers highly recommend

  4. Susie White (verified owner)

    Incredible product, my horse has previously hated all the muzzles I got for him. He’s lovely to handle but the minute I tried to put one on him he was awful. He’s not fussed when I put this one on him and is happy as larry with it on all day. I’m about to order another for my other horse as I’m so impressed with it.

  5. Cerys Brown (verified owner)

    Fantastic muzzle. Lightweight, flexible and easy to fit. A must for any horse with EMS or laminitis who needs to wear a muzzle for long periods.

  6. Nichole Rice (verified owner)

    This is the BEST muzzle on the market currently. My Cob LOVES his. He never complained about wearing his bucket muzzle, but I always felt guilty especially when it is really hot and he was sweating in it and it rubbed him on his chin. With this flexible filly muzzle he looks like he is not even wearing a muzzle. He never has rubs and never sweats. THANK YOU SO MUCH FOR CREATING THIS PRODUCT!!! A bit fiddly to get the right fit, but sooo worth it ! TEN STARS

  7. Sam Sharpe (verified owner)

    Very pleased with the grazing muzzles, my 2 Spanish mares have always been good doers but other muzzles have either rubbed them or not stayed on. These work great, no rubbing , no problem keeping them on and they don’t mind having them put on. The girls are both at stud at the moment and the vets think they are great and approve of them greatly. So glad I decided to try them.

  8. Anonymous (verified owner)

    Delighted with the Flexible Filly grazing muzzle it’s so easy to use and my horse has accepted it easily.

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