ThinLine Reinvents the Grazing Muzzle

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Unlike Any Others, The Flexible Filly Muzzle is made of Supple, Lightweight Material and Features An Adjustable Grazing Hole.

The Flexible Filly Grazing Muzzle has an adjustable grazing hole size to customize the muzzle to your horse’s dietary needs. The muzzle is manufactured with food grade resins that provide a durable yet lightweight, flexible alternative to traditional muzzles.

Veterinarian recommendations for safe grazing in a muzzle are a 3.5 to 4 cm grazing hole for full-time grazing, and 2 to 2.5 cm for restricted grazing often required for horses with metabolic issues. The industry standard is 3 cm and grazing holes are not adjustable.

The Flexible Filly Muzzle now makes it easy to work with your veterinarian to ensure your horses are safely turned out to graze on any pasture. The muzzle’s 2 cm hole can be enlarged to meet any grazing need with a simple pair of scissors.

The Flexible Filly Muzzle is made of a synthetic resin, a substance of plant origin that is synthetically created to produce a polymer. This gives it a high tensile strength (+700 psi) and a tear strength of +550 ibf/in. It complies with FDA requirements for food safety and contains a natural UV protection. Its light, thin appearance contradicts the extreme durability of the polymer material it’s constructed with. 

Traditional muzzles are rigid and present a variety of problems. They can rub or chafe a horse, fill up with debris, and become hot and uncomfortable, as well as causing wear to horses’ teeth. However, for owners of insulin-resistant or overweight horses or ponies, muzzles are a way of life. For them, the worry of colic or laminitis (founder) is constant. Now, with the Flexible Filly Muzzle, owners can choose this lightweight, flexible option as a means to appropriately limit their horses’ grazing.

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“The Flexible Filly Grazing Muzzle is something horse owners won’t feel guilty about putting on their horses,” says Elaine Lockhead Castelao, ThinLine Founder. “We approached the design of this muzzle from the perspective of the horses’ comfort and safety and the owner’s peace of mind, and believe after several years of testing we’ve created a muzzle that’s effective, lightweight, flexible, durable, and easy to care for.”

Arriving with a 2 cm hole for restricted grazing, this muzzle has the added benefit of allowing owners to create any grazing hole size they feel will most benefit their horse.

The supple material is soft on equine faces, teeth, and lips, preventing tooth wear and sores and general discomfort. It’s UV-resistant to protect equine noses from sunburn. The muzzle’s open design allows for extra airflow, further improving comfort. It’s built to be flexible so the chance of the muzzle getting snagged is reduced, yet rated to break before your turnout halter. Low-profile zip ties come with the muzzle so it can be easily and securely fastened to the horse’s halter. Custom halters designed to make the Flexible Filly Muzzle easy to apply and maintain are also available.

It is time to feel good about your horses’ health.

Flexible Filly Grazing Muzzles are available in Canada at, and elsewhere at,, or at select equestrian retailers.

Photos courtesy of

Flexible Filly Grazing Muzzle