Thinline Flexible Filly Grazing Muzzle

(72 customer reviews)


Softer, Smarter & Safer!

The Flexible Filly slow feed grazing muzzle is designed to be softer, lighter, and less behaviourally restrictive.


  • Safe and pliable food-grade material.
  • Infused UV skin protection.
  • No wear on equine teeth, comfortably soft on lips.
  • Well-ventilated, lightweight, flexible.

Equine Behavioural Effects

  • Radically improves the horses’ ability to live a normal herd life in a muzzle.
  • Returns behaviours like wither scratching and play.
  • No fussing when putting the muzzle on.

Horse Owner Benefits

  • Your horse is both safe and comfortable.
  • You get the correct grazing hole size for all seasons, grass types, and hay.
  • Easy hydration with any bucket, trough, or automatic waterer.
  • Clear for easy monitoring.
  • You get to see your horse happy in a grazing muzzle.

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.

This muzzle is covered by a 30 day and 90 day warranty, please see below for full details

Save with our bundle offer comprising of muzzle and halter here


Thinline Flexible Filly Slow Feed Grazing Muzzle

Thinline Flexible Filly Grazing Muzzle is available in three sizes;

  • Small
  • Medium
  • Large

What size should you choose? 

Pony or cob size halter with small nose = Small

Cob size halter with longer nose or Full size with small nose = Medium

Full size halter with longer nose or XF halter = Large

We are happy to give advice on which size is best – please either message us, email us or Contact Us – The Comfy Horse Company enclosing a photo of your horse’s head.

About Grazing Muzzle Hole Sizes. Good to know!

Veterinarian recommendations for safe grazing in a grazing muzzle for Horses is a 3.5 to 4 cm grazing hole for 24/7, full-time grazing.
And 2 cm for very restricted grazing, often required for horses with metabolic issues.

What will you need?

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

How to attach your Flexible Filly Grazing Muzzle?

  1. 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.
  2. 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 noseband, one in the centre, the other two fall naturally to the sides of the centre.  Three fins will connect to the chin band: one in the centre, two naturally to the sides of the centre.
  3. 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.
  4. 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.
  5.  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.
  6.  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 before trimming. The “keeper” on the cable tie is on the outside of the muzzle and the excess is facing down and trimmed close.

If you have fitted the muzzle properly and the muzzle is the correct size it will work famously. 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 noseband. If it does simply pull the cable tie tighter.

Additional Fitting Tips

With the horse’s head in the upright position, it is OK if the muzzle lightly touches the lips. Horses spend most of their time with heads at ground level. Lower their head to check there is about a half inch of clearance when the horse is in grazing position.

If your horse is attempting to eat out of the sides, this generally means they are not able to get grass through the centre hole.  The size of the centre grazing hole needs to work with other variables such as the height and thickness of the grazing grass.  We provide the smallest of grazing holes with the ability to enlarge it.  Just look to see if you might need to enlarge the hole.

If the problem persists, check the horse’s fit while in the grazing position.

  1. a) Lower your halter and make sure your muzzle is not on the top hole, the “leggier” the fins are the easier it is for them to try to eat out of the sides.  Raise the entire muzzle up several holes.  If this does not work, you might need a smaller muzzle.
  2. b) Make sure the fins between the front (or back) fin and the side (attached to the square ring) are evenly spaced.  If you have the fins neighbouring the centre front or centre rear too close to the centre one the horse will be able to eat out of the sides rather than the grazing hole.

The closer you fit the muzzle to your horses’ lips the less likely it is they will step on the muzzle and tear it.

This video should help!

Please also see attached our guide to fitting muzzle Top Tips – Flexible Filly Fitting! – The Comfy Horse Company

Care Instructions

  • First, you can place the grazing muzzle in a net washing bag and wash on cold water with detergent and a teaspoon of bleach.
  • Second, more extended clean, stick it in a bucket with dish soap and a cap full of bleach.

Package Includes:

  1. Grazing Muzzle
  2. Instructions
  3. Twist ties for initial setup
  4. 12 permanent ties – 55# tensile strength
  5. Reusable packaging

Used Materials

The grazing muzzle is made from one of the most durable polymers on the planet.  It is fungal, mould and UV resistant.  It is safe, effective, and durable.  There are no “off-gassing” materials, so they are safe near the nostrils.  Even if accidentally ingested the polymers pass USA food safety regulations.  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.

Returns and Warranty Information 

90-day limited warranty – One time replacement if ThinLine deem there is a manufacturing fault.


  • ThinLine zip ties must be used.
  •  A break away halter must be used.
  • Photos and proof of purchase required.
  • Any modifications or issues caused by normal wear and tear will void warranty.

Please note: Your horse’s safety is paramount. There are safety breakpoints in place to prevent the risk of injury to your horse while wearing the grazing muzzle and breakaway halter. 

If the cable ties or fins snap – this is part of the design to ensure your horse isn’t caught up.

Normal wear and tear included but not limited to: 

  • Discoloration, teeth marks/grazing hole wear caused by exuberant grazers or pasture mates.
  • Damage caused by a safety feature working resulting in a torn fin.


30-day satisfaction guarantee:

Should you decide not to keep your grazing muzzle, you are responsible for all return shipping costs, but 100% of your purchase price will be refunded with proof of purchase.  Please be sure to clean products to the best of your ability and make sure items are completely dry before packaging for return. Any modifications made to muzzles will void this guarantee.



Additional information

Weight N/A

Small, Medium, Large, XXL

72 reviews for Thinline Flexible Filly Grazing Muzzle

  1. Alex R.

    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

    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

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

  4. Susie White

    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

    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

    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

    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

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

  9. Jackie B.

    Excellent service, thank you

  10. Cecile

    Very good, safety and so lightweight , doesn’t move. My horses hated the last grazzing muzzles ( that did a great job, but were a bit to heavy) . No fight to put it, but a bit longer to understand how to get the grass than other grazzing muzzle.
    More difficulties to catch the hay for mine … but They managed to

  11. Quita

  12. Anonymous

    Great product. Highly recommend

  13. Andrew Storr

    Fabulous service and product. This is the best muzzle we’ve tried by far

  14. Anonymous

    I found this tricky to get the correct fit but with some brilliant customer service and support got there in the end and now really rate this muzzle, def worth the extra time and pennies compared to the many other brands I’ve tried!

  15. sophie bohme

    Takes a while to fit it but fab product once done

  16. Nichola G.

    Very helpful in ensuring the correct fit, assessing from photos and changing the sizing.

  17. Rowena

    A brilliant product that helps manage the weight of my Welsh Sec A.
    No rubbing or her trying to take it off. Well worth the money.

  18. Gillian b.

    So much kinder than traditional muzzles

  19. Irene Barrett

    Really pleased, no rubs and very flexible a definite improvement on what I’ve been using.

  20. Sandra

    Easy to fit, no rubbing and kind to teeth, this has been a game changer for my houdini pony that has been through 7 muzzle styles previously with no success.

  21. Julie Herriott

    Have only tried to use it once as the grass isnt the right length and pony just got frustrated.

  22. Elizabeth Watt

    Took a bit of mental work to figure out how to attach it, but once that was done it is brilliant. However, I bought a cob size that fits nicely on the 12.2hh pony but might be a stretch on a big cob.

  23. Violetta N.

    the best grazing muzzle ever. do not get dishearten when attaching to a halter – it is really worth an effort to fit it well and it is worth its price.

  24. Anonymous

    Fast service muzzle looks good

  25. Emma F.

    This grazing muzzle is a must if you have a laminitic/EMS pony! I have always managed my boy’s lami by bringing him in off the grass for 13 hours everyday, rather than by using a muzzle. But saw these and thought they looked a better design than all the other webbing or plastic style muzzles available. What I really liked is it sits away from the face, on top of a regular leather head collar, so no rubbing at all and it’s so light for them to wear. He can drink happily out of it, and if the grass is wet, it doesn’t end up all soggy and heavy. No idea if it is affecting his teeth – but so far, he looks completely normal when he is grazing. He is out most of the time now and is much happier than stuck in the yard most of the day. On sizing, initially I got it wrong as I thought because he’s a 14.1hh chunky Connemara in a cob sized bridle (with a full sized head piece) he would need a medium but after the excellent help from Claire and Laura at Comfy horse, we moved him down into a pony size muzzle and the fit is now perfect. We also have a very fine over height British Riding pony, and the pony size fits her too. They are generously sized, and if your pony starts eating out the side, it’s probably too big! Once fitted correctly they are fantastic. You can make the hole bigger, but with a pony like mine, I decided to stay safe and keep it small! Would definitely recommend if you are thinking about buying one!

  26. Sheena Smith

    Top customer service. I can’t recommend Comfy Horse highly enough. I bought a flexible filly grazing muzzle for my welsh D, I’d used conventional muzzles before, but they either rubbed his face or the back of his lower lip, so started restricting his grazing, which him and his companion weren’t happy about as they both love having a play and a gallop in their paddocks, a friend showed me her ‘new muzzle’, the flexible filly, she let me try it and pow! he used it without objection and after the first week, he had lost some weight so i bought one to see how it went before buying another for my welsh mare, everything went really well with the one i bought for my gelding, so i went ahead and purchased another for my mare, so 2 lots of £74.99 + p&p…expensive, but far cheaper than a vets bill for colic or laminitis, and altogether happier, fitter horses who enjoy being ridden. One (or 2) of the best items ive bought for my 2 Welsh Ds. Claire and Laura were so nice and efficient in dealing with my orders quickly. Since seeing how well my 2 have coped with the Flexible Filly grazing muzzle, my best mate has also bought one for her horse and agrees that it was well worth the money.

  27. Nikki S.

    Great little muzzle always horrible to have to put these on but this makes me feel less guilty

  28. Suzanne M.

    Great hasn’t rubbed and I’ve tried most on the market as my horse gets determined to get as much grass as she can, so eventually even with well padded muzzles She will often get sores. Will aim to test it over the next few months.

  29. Sue

    He has certainly lost weight while wearing this, but no problems with rubbing. There is a slight split developing at the hole after two months’ use, but it doesn’t seem to be a problem yet. Much better than his old muzzle.

  30. Violetta N.

    the only muzzle that does allow for breathing, with well fitted halter – it is impossible for a pony to remove; the hole is “adjustable” …the only muzzle that we use for our ponies…we have two muzzles in daily use for over a year and still going strong…highly recommended

  31. Elizabeth TEAR

  32. Lotta

    Easy to order and my items arrived promptly. I also needed to return one item and it was refunded without issue. I would order again from Comfy Horse.

    I found I had to fit the muzzle tighter than the instructions initially as my pony worked out how to eat from the gaps from the sides. Once he had worked out how to eat through the central hole (which I made a bit bigger) I was able to loosen it off again. I’m delighted with it and I think it’s much more comfortable for the horse than the traditional bucket muzzles.

  33. Louise

    Very fast delivery, packaged well, great service from comfy horse, the muzzle is as described and it’s working really well so far. Very pleased would recommend.

  34. Claire

    Excellent – would thoroughly recommend.

  35. Gillian B.

  36. Jane Pether

    Great Efficiency as usual . Thank you . This product is just the best 5 ⭐️

  37. Louise B.

  38. Philomena D.

    Really pleased with the Flexible Filly muzzle, and very happy with the quick service from The Comfy Horse. Thank you

  39. Jackie B.

    First class, friendly service as always

  40. Megan

    Fantastic muzzle, which does not rub thus far. Quick delivery and for one a website that showed accurate stock levels.

  41. Jane Rodgers

    It took a while to to be despatched, despite saying it was in stock. A courtesy message to advise delay and why would have been helpful.

  42. Sharon Swain

    Brilliant product. Hasn’t rubbed and horse seems happy

  43. Vinnie Stevens

    Couldn’t fault the service received the muzzle always out of stock and they called me as soon as it came back in and it arrived so quickly!

  44. Julie Hubbard .

  45. natasha

    Excellent product

  46. Vicky E.

    Love! Love! Love! Bought this for my pony and he’s been wearing it 24/7 with no issues! Comfy to wear and it really works! I’ve noticed the difference in 10 days. He lives out 24/7 on hood grass with two others. This muzzle allows him to stay with his friends whilst also losing weight.

  47. Kate

    I used a shires muzzle last which rub him, the slow feed muzzle is a big improvement for him and more comfortable

  48. Kate B.

    I have to say I find this grazing muzzle well thought out. It is light yet strong & does just enough to restrict how much is grazed. My pony is relaxed about wearing it.

  49. Catherine

    Good company to deal with on price comparison and prompt delivery

  50. Saira B.

  51. Karen McBain

  52. Natasha Smith

    By far the best muzzle on the market,
    And as always a prompt and efficient service from comfy horse

  53. Karen B. (verified owner)

    Fabulous product, allows my horses to graze for longer knowing their intake is less. The best muzzle on the market in my opinion! Very flexible and soft for the horses. Followed up with great product support from the team at comfy horse in regards to fitting etc Thanks

  54. Wendy S. (verified owner)

  55. Katherine S. (verified owner)

  56. Kim S. (verified owner)

    Kinder for the horse

  57. Jennifer G. (verified owner)

    Absolutely brilliant. Only muzzle she doesn’t try to keep removing. Ingenious design and horse truly does not seem too bothered as it’s so light and airy.

  58. Katherine S. (verified owner)

  59. Anonymous (verified owner)

  60. Joanna Lunn (verified owner)

    Horse happily wears it and has lost a girth hole !!!

  61. Jayne hatton (verified owner)

    Fits well. pony is happy. Good customer service support

  62. Sam (verified owner)

    Great service love the muzzle.

  63. Tara M. (verified owner)

  64. Jackie B. (verified owner)

    1st class service as always, thank you

  65. Maureen Jones (verified owner)

  66. Claire Melrose (verified owner)

  67. Amy C. (verified owner)

  68. M Morphet (verified owner)

    Great product

  69. Susanne Hosbach (verified owner)

  70. Faye (verified owner)

    I’ve been really impressed with this muzzle. My horse is happy to wear it, I cut the hole to a 4cm hole as I just wanted to reduce his grass intake not starve him 😂. Customer service was fantastic, really impressed. Thank you Claire and Laura

  71. Anne S. (verified owner)

    The product itself is excellent.

  72. Jackie B. (verified owner)

    Excellent muzzle

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