Slicker Brush vs Undercoat Rake: Which Do You Need

By Meghan Jaskot, DVM

Grooming & Coat Care · August 5, 2026 · 6 min read

A slicker brush and an undercoat rake solve different coat problems, and most double-coated dogs eventually need both.

The first time I sat down with a nine-year-old Chow Chow named Bear, his owner had already bought three brushes off the internet and none of them had made a dent in the mats building up behind his ears. She’d been using a slicker brush every day, diligently, and couldn’t understand why his undercoat still felt like felt. The problem wasn’t effort. It was tool selection — a slicker brush was never going to pull the packed, dead undercoat out from underneath an intact topcoat, and no amount of daily brushing with the wrong instrument was going to fix that. Once we switched her to an undercoat rake for the underlayer and kept the slicker for finishing, the difference showed up within two sessions: less pulling, less resistance, and a dog who stopped flinching when the brush came out.

What a slicker brush is actually built to do

A slicker brush is the fine-wire-bristle brush most owners picture when they think “dog brush.” The pins are short, closely spaced, and usually angled or slightly bent at the tip so they can catch loose surface hair and break up small tangles without digging deep into the coat. That design makes it a good all-purpose tool for medium-to-long, curly, or wavy coats, and it’s genuinely useful on almost any dog for finishing work — smoothing the topcoat, lifting it slightly, and catching the last bit of loose hair after a deeper tool has done the heavier lifting.

Where slicker brushes fall short is depth. On a dog with a true double coat, the dense undercoat sits underneath a coarser topcoat, and a slicker brush’s short pins mostly work the surface. Used too aggressively or too often on the same spot, a slicker brush can also cause what groomers call brush burn — a mild skin irritation from repeated fine-wire contact. Short, gentle strokes with a light hand matter more than pressure here.

What an undercoat rake reaches that a slicker brush can’t

An undercoat rake carries longer, more widely spaced teeth designed to pass through the topcoat and hook onto the soft, dense underlayer beneath it, pulling loose dead hair out at the root without shredding the guard hairs on top. This is the tool built for breeds that carry a real undercoat — German Shepherds, Huskies, Chows, and similar double-coated dogs — and it does the job a slicker brush structurally cannot: reaching the layer where shedding actually originates.

Fit matters more with a rake than with almost any other grooming tool. The pin length needs to roughly match the depth of the dog’s coat; too short and it never reaches the undercoat, too long and the teeth can drag against skin that was never meant to be raked. According to the What Is a Double Coat, and What Dog Breeds Are Double-Coated?: American Kennel Club, double-coated dogs shouldn’t be shaved, since shaving removes both the undercoat and topcoat and can interfere with the coat’s natural insulation — which is exactly why raking, not clipping, is the tool of choice for managing a heavy undercoat.

Why most double-coated dogs end up needing both

In my day-to-day practice, the dogs who struggle most with coat problems aren’t the ones whose owners chose the “wrong” single tool — they’re the ones trying to make one tool do a job it wasn’t built for. A slicker brush alone on a Husky in full seasonal shed just moves surface hair around while the packed undercoat stays put. An undercoat rake alone on a low-shedding, curly-coated breed can be more aggressive than the coat needs and irritate skin for no real benefit.

The AKC’s own How to Groom a Dog at Home: grooming guidance points toward matching tool to coat type rather than defaulting to one brush for every dog: longhaired dogs generally need a different approach than short- or medium-coated breeds, and slicker brushes are best suited to breaking up mats and lifting dead hair rather than clearing a deep undercoat. For a dog that carries both a topcoat and a substantial undercoat, the practical sequence most groomers land on is: rake first to clear the bulk of the dead undercoat, then finish with a slicker to smooth and lift the guard coat. Weekly combing is generally enough to keep a double coat from matting between sessions, according to AKC guidance on double-coated breeds.

I’ve watched this play out season after season with dogs coming through for their spring wellness visit. A ten-year-old Husky mix named Nova came in every March with the same story: the owner brushing daily with a slicker, frustrated that clumps of undercoat kept surfacing days later on the couch and car seat despite all that effort. Nova was overweight for her frame, and her owner had been hesitant to add “one more brush” to the routine, worried it would stress a dog who already disliked grooming sessions. We talked through switching to a short rake session — five minutes, twice a week, done gently and stopped the moment Nova seemed uncomfortable — paired with the slicker only for finishing. By the following visit, the shedding on furniture had visibly dropped, and Nova tolerated the shorter, more targeted sessions better than the long daily slicker-only routine ever managed.

Reading your dog’s coat before you buy anything

Before reaching for either tool, run a hand through the coat down to the skin. If you feel a soft, dense layer under a coarser top layer, you’re dealing with a double coat, and a rake belongs in your kit. If the coat feels uniform in texture from surface to skin — common in many curly or single-coated breeds — a slicker brush may be all you need, possibly paired with a metal comb for finishing.

I’ll be honest about where the evidence gets thin: there isn’t strong controlled research comparing shedding outcomes between rake-only, slicker-only, and combined routines. What exists is groomer and veterinary consensus built from repeated hands-on experience, not clinical trials, and individual dogs vary in coat density, skin sensitivity, and tolerance for handling regardless of which tool you use. If a dog’s skin looks red, flakes excessively, or the dog reacts painfully to brushing that seems appropriately gentle, that’s a reason to loop in your vet rather than assume you simply picked the wrong brush.

Dental and nail care follow a similar logic of matching tool to task rather than defaulting to habit — the same reasoning that applies when choosing a nail grinder or working out how to brush a tiny dog’s teeth. And coat care doesn’t stand alone: bathing frequency interacts with brushing, since a clean, dry coat is easier and safer to rake without dragging on tangled, oily hair — our guide on how often to bathe a dog covers how coat type should set that baseline. Breeds carrying a heavy seasonal undercoat, like German Shepherds, also go through a distinct coat-blow period that changes the grooming math entirely, which we cover in how to groom a German Shepherd through coat blow.

My bottom line

If your dog has a true double coat, don’t try to make a slicker brush do a rake’s job — you’ll spend more time brushing for less result, and possibly irritate skin in the process chasing hair that’s sitting too deep for the tool to reach. Buy the rake, size the pins to your dog’s coat depth, and use gentle, short strokes rather than force. Keep the slicker brush for surface finishing, mat-breaking, and the dogs whose coats never had a true undercoat to begin with. For most double-coated dogs, the two tools aren’t competitors — they’re doing different jobs in the same routine, and skipping one just means the other has to work harder than it was designed to.