Course 15 · Double Coats · Lesson 5 of 12

How do you brush a double coat without breaking guard hairs?

Published 29 October 2026 · Updated 29 October 2026 · About 6 minutes · General information only. This lesson does not diagnose or treat any condition.

Brush a double coat without breaking guard hairs by working in small sections, combing from the ends toward the skin, using a wide toothed comb and an undercoat rake with light pressure, holding the base of each section, and never dragging tools forcefully through tangles or dry, dirty coat. Guard hairs are the long, coarse hairs that protect the coat, and they break when tools are used hard, when hair is pulled, or when blades and aggressive deshedding tools are used. Gentle, sectioned brushing removes loose undercoat while leaving guard hairs intact and the coat smooth.

Why do guard hairs break, and why does it matter?

Guard hairs break when they are pulled, bent, cut, or dragged through tangles, when tools are used with heavy pressure, or when the coat is brushed dry and dirty, with grit acting as an abrasive. They also break when deshedding blades, thinning shears, or clippers are used on a double coat, because those tools cut hair rather than removing loose hair. Broken guard hairs matter because they leave the coat looking frizzy, dull, and uneven, they reduce protection from weather, sun, and dirt, and they allow undercoat to dominate, which mats more easily and sheds broken hairs. A coat with broken guard hairs is harder to groom, because the uneven surface traps more loose hair, and it takes a full coat cycle to regrow guard hairs to their proper length. Protecting guard hairs is therefore not cosmetic: it preserves the coat’s function. Owners should check for breakage by looking at removed hair: loose undercoat is soft, pale, and fluffy, while broken guard hair is longer, coarser, and has a blunt or split end.

What tools and pressure protect guard hairs?

A wide toothed comb protects guard hairs best, because it parts the coat, finds tangles, and removes loose hair without cutting. An undercoat rake, used lightly in the direction of hair growth, removes loose undercoat while leaving guard hairs largely untouched, provided pressure is light and sections are small. A slicker brush, used gently and briefly to smooth the top coat, can help, but it should not be pressed into skin or used repeatedly over the same area, because it can break guard hairs and scratch skin. A deshedding tool should be used only sparingly, on suitable coats, during blowing, with light pressure, as in the shedding course. Avoid blades, thinning shears, clippers, and furminator style tools used aggressively, which cut guard hairs. Pressure should be light throughout: if the tool bends hair flat, if the dog flinches, or if the comb catches and pulls, pressure is too much.

How do you brush in sections to protect guard hairs?

Brush in sections, as in the shedding course, parting the coat to expose a small area, holding the base, combing from the ends toward the skin, then using the rake lightly, then combing again to check that guard hairs lie smoothly. Work in the direction of hair growth, without brushing against the grain repeatedly, which bends and breaks hairs. Keep sections small, about the width of the comb, and overlap slightly so no area is missed. Work the body first, then legs, chest, and tail, leaving sensitive areas for last, with extra gentleness. Pause to remove loose hair from tools, reward the dog, and check skin in each section. If a section has a tangle, work it out with fingers first, as in the matting course, before using a comb or rake, because dragging a tool through a tangle will break hairs and pull skin.

1. Part coat into a small section, hold base gently.
2. Comb from ends toward skin, light pressure, direction of growth.
3. Use rake lightly to lift loose undercoat, check removed hair.
4. Comb again, check guard hairs lie smooth, check skin.
5. Move to next section, overlapping slightly, pause and reward.

How do you recognise and correct breakage?

Recognise breakage by looking at the coat and at removed hair. The coat may look frizzy, dull, or uneven, with short, broken hairs standing out, especially on the back and sides. Removed hair may include long, coarse hairs with blunt ends, rather than only soft undercoat. Skin may be red or sore if tools have been pressed hard. If breakage is noticed, stop, check tools and pressure, and switch to a wide toothed comb only, with very light pressure, until the cause is clear. Ask a groomer to demonstrate technique in person, and to check whether tools are suitable for that coat. Do not try to correct breakage by brushing more, by using a different blade, or by clipping the coat, because those actions will worsen it. Allow time for guard hairs to regrow, groom gently in the meantime, and keep the coat clean and dry. Recovery takes time, and patience is part of protecting the coat. Note the cause, such as a tool, pressure, or dry dirty coat, so it is not repeated.

When should you stop and get help?

Stop brushing and contact a groomer or vet if skin is red, sore, scratched, or bleeding, if the dog shows pain, if coat becomes patchy, thin, or frizzy, or if the owner is unsure about tools or technique. A groomer can demonstrate sectioned brushing, advise on tools, and assess coat damage. Do not continue brushing sore skin, and do not use blades or clippers to try to fix breakage. Guard hairs, once broken, need time to regrow, and gentle care in the meantime protects what remains. Brushing that is sectioned, gentle, and light protects guard hairs, and that protection is what keeps a double coat functional and beautiful over years.

Light pressure, small sections, comb first, base held, and no blades keep guard hairs intact, and a smooth coat with healthy skin is the sign that brushing is being done correctly.

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