How to Measure Your Horse for a Rug: The Complete Size Chart and Fit Guide

Getting the right rug size for your horse is one of those things that sounds straightforward until you’re standing in the field with a tape measure and a horse who won’t stand still. Get it right and your horse stays comfortable, dry, and rub-free through even the worst Irish weather. Get it wrong and you’ll be dealing with sore shoulders, a rug that slips back, or a shell that doesn’t cover what it needs to.

This guide walks you through exactly how to measure, what the numbers mean, and how to interpret a horse rug size chart for your specific horse — whether you’re buying for a lean Thoroughbred, a deep-chested Irish Draught, or a stocky cob.

What You’ll Need Before You Start

·      A soft fabric tape measure (a standard sewing tape works perfectly)

·      A helper to hold the tape — or a fence post at a pinch

·      Your horse standing square on level ground

How to Measure Your Horse for a Rug: Step by Step

The measurement used for horse rug sizing is taken along the body — not the height at the withers, which is how we measure horses in hands. Rug sizes are based on body length.

Step 1: Stand your horse squarely on level ground.

Step 2: Find the centre of the horse’s chest at the point of the shoulder. This is roughly where the neck meets the chest, at the bony prominence you can feel just in front of the shoulder joint. (Point A)

Step 3: Run the tape measure along the side of the body — not over the top of the back, but along the natural contour of the barrel — to the point of the buttock. This is the bony prominence on either side of the tail. (Point C)

Step 4: Note the measurement in inches. This gives you your rug size.

Most horse rugs are sized in feet and inches (5’0, 5’3, 5’6, 5’9, 6’0, 6’3, 6’6, 6’9, 7’0) and this measurement maps directly to that system. A horse measuring 66 inches takes a 5’6 rug, for example.

Horse Rug Size Chart

Use the table below to find the right rug size from your measurement.

If your horse falls between sizes, it is generally better to size up rather than down. A rug that is slightly too long will cover more of the hindquarters; a rug that is too short will pull back across the shoulders and cause rubbing.

Breed-Specific Fit: Why One Size Doesn’t Fit All

The size chart above gives you a starting point, but horse rug sizing is not a one-size-fits-all situation — and this is especially true for the range of breeds common in Ireland.

Irish Draughts and Cobs

Irish Draughts and native cobs tend to have broad, deep chests, well-sprung ribs, and wide, muscular hindquarters. They often need a rug that offers good width and depth across the barrel — not just length. A heavier type measuring 6’0 in body length may need more lateral coverage than a 6’0 rug designed for a lighter horse.

For these breeds, pay particular attention to how the rug sits across the back and whether the belly flap covers the undercarriage properly. Sizing up by a few inches often helps with coverage, even if the length is technically within range.

Thoroughbreds and Sport Horses

Thoroughbreds are typically fine-boned with long, lean necks, prominent withers, and narrower shoulders relative to their body length. This combination makes them particularly prone to shoulder rubbing, especially if a rug sits too flat across the point of the shoulder without allowing freedom of movement.

If you have a TB or a competition sport horse with well-defined withers, shoulder fit is arguably more important than overall length. A rug that binds across the front will restrict movement and cause sores regardless of how well it fits everywhere else.

Warmbloods

Many warmbloods — common in Irish sport horse and dressage yards — are notably long-backed relative to their height. It is not unusual for a warmblood to measure a full size larger in body length than you would expect from looking at their height. Always measure rather than estimating based on height or breed.

What a Well-Fitted Rug Looks Like

When a rug fits correctly, you should see:

·      Chest fit: The chest fastenings (cross surcingles or front buckles) should sit snugly but not pull tight. You should be able to fit a hand flat between the rug and the chest.

·      Shoulder freedom: The rug should not sit directly on the point of the shoulder. There should be a visible gap — enough room that the fabric moves freely as the horse walks without dragging on the shoulder.

·      Wither clearance: The wither area should not be under pressure. You should be able to run two fingers comfortably under the rug at the withers.

·      Spine clearance: The rug should not press down onto the spine. Look for a slight tent shape along the topline when the rug is on.

·      Tail coverage: The cheek of the horses rump will often stick out past the end of the rug when fitted correctly. If the horse rug is too long, it can cause the rug to pull backwards and can get in the way of the horses tail.

What a Poorly Fitted Rug Looks Like

Signs that a rug does not fit well include:

·      Rubbing on the shoulders or withers (bare, thin, or broken patches of coat)

·      The rug sliding back over time, despite correct fastening

·      Pressure marks along the back or spine

·      The rug sitting up at the back rather than lying flat against the hindquarters

·      Front closures that are constantly coming undone because the chest fit is too tight

The Shoulder Gusset: A Better Solution to Shoulder Rubbing

Shoulder rubbing is one of the most common rug-related complaints from horse owners — and it is usually caused by rug design rather than rug size. A flat-cut rug creates friction directly on the shoulder joint as the horse moves, regardless of how well it fits in length.

The Active Equine Freedom Turnout features a high shoulder gusset — a design that allows the rug fabric to move with the horse’s shoulder rather than against it. Instead of a flat panel lying across the point of the shoulder, the gusset creates space for natural movement, dramatically reducing friction and the risk of hair loss or soreness.

For horses that have historically suffered with shoulder rubbing, this design feature makes a significant practical difference — and it benefits all horse types, not just narrow-shouldered Thoroughbreds.

A Note on Neck Cover Sizing

If your horse’s rug comes with a detachable neck cover, this is typically sized to match the rug. Neck covers are measured from the wither to the poll along the crest of the neck. Most detachable neck covers are sold as accessories matched to the rug size, so if you buy a 6’0 Freedom Turnout, the matching neck cover will be sized for a horse in that range.

Ready to Find the Right Fit?

Now that you have your measurement and understand what to look for, explore the Active Equine Freedom Turnout range — available in 0g, 50g, and 100g fill options, with an optional detachable neck cover, in sizes from 4’9 to 7’0. Designed with a high shoulder gusset as standard, built with a 1200D outer shell for durability, and rated 5000/5000 for waterproofing and breathability.

Shop the Freedom Turnout collection at activeequine.ie