What Size Slicker Brush Do I Need?

Match the head size to the smallest area you need to reach, not to the size of the dog. Small suits cats, toy breeds, faces, ears and paws. Medium suits most dogs from a cockapoo to a spaniel and is the safest single choice. Large suits big bodies and heavy shedders, and is a body brush rather than an all-rounder.

Almost everyone chooses by dog size, which is why so many owners end up with a brush that covers the back beautifully and cannot get near the ears. Head size determines where the brush fits, and the awkward areas are where the mats are.

The other half of the answer is that many households genuinely benefit from two. A large or medium for the body and a small for detail work is the combination most professional groomers use, and it is not an upsell so much as a description of how the job actually splits.

Here is how to choose, by coat and by dog, and when one brush is enough.

Why Head Size Matters More Than Dog Size

A brush can only work where it fits. A large head is fast across a back and flank, and it is useless behind an ear, under a chin, between the front legs or on a small face.

Those awkward places are precisely where mats form. Behind the ears, in the armpits, on the trousers at the back of the thighs, and around the collar line. A brush that cannot reach them is not maintaining the coat, it is maintaining the parts of the coat that were never going to be a problem.

Speed matters too, but less than people think. A large brush covers more ground per stroke, but if you are brushing correctly, in sections and from the skin outward, most of your time goes on parting the coat rather than on the stroke itself.

The one place large heads genuinely win is on big double-coated dogs during a seasonal shed, where you are removing a great deal of hair from a large surface and the volume is the whole job.

The Three Sizes

Small

For cats, toy and small breeds, puppies, and for detail work on any dog regardless of its size.

A small head gets into the places that matter: behind and around the ears, under the chin and the jawline, the armpits, between the front legs, around the collar, the feet and the leg feathering.

If you own a large dog and only one brush, a small head will still get the whole dog done. It just takes longer on the body. The reverse is not true: a large head cannot do the detail work at all.

Medium

The safest single choice for most households, and the one to buy if you are buying one brush and are not sure.

It suits dogs from around a cockapoo or a beagle up to a spaniel or a border collie, and it is workable on the body of a larger dog too. It is small enough to handle the chest and the back of the legs, and large enough that brushing a whole dog does not take an hour.

Large

For big bodies and heavy shedders: retrievers, German shepherds, huskies, malamutes, newfoundlands, and any large double coat.

Treat it as a body brush. It will cover the back, sides and hindquarters efficiently during a shed, and you will still want something smaller for the head, ears and legs.

Choosing by Coat Type

• Long-haired cats. Small, always. Cats do not tolerate a large head near the face, and their skin is thin enough that control matters more than coverage.
• Toy and small breeds. Small. A yorkie, a maltese or a shih tzu is mostly detail work.
• Doodles and curly coats. Medium for the body, small for the face, ears and legs. Curly coats mat in exactly the places a large head cannot reach.
• Spaniels and setters. Medium. The feathering on the legs and ears is the real job, and a medium head handles it.
• Large double coats. Large for the body during a shed, medium or small for everything else.
• Short smooth coats. Medium is plenty. There is very little to reach into.
• Puppies of any breed. Small, for the first six months. Short sessions, small tool, gentle introduction.

Flat or Curved

Size is one decision and head shape is another. Put simply, a flat head covers ground and suits body work on most coats, while a curved head follows the contour of legs, chests and faces and reaches into the hollows.

If you are buying one, a flat head in medium is the most versatile combination. If you are buying two, a flat for the body and a curved small for the detail work covers almost every situation.

Curved heads with longer pins are particularly useful on doodles and long-coated dogs, where the pins need to travel further to reach the skin.

Recommended Slicker Brush Sizes and Shapes

Flying Pawfect makes both the flat and the curved slicker brush in small, medium and large, in coral and baby blue, so the size decision does not force you into a different tool.

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Flying Pawfect Flat Slicker Brush

The flat slicker is the general purpose choice, and it comes in small, medium and large so you can match the head to the areas you actually need to reach.

Whatever the size, the construction is the same. Fine stainless steel pins with a slight bend and a smooth, burr-free tip, set in a cushion pad that flexes and returns. The pins pass between the guard hairs and lift loose undercoat out from underneath rather than smoothing the surface.

Medium is the size to choose if you are buying one and are unsure. It handles the body of most dogs without being too large for the chest, the armpits or the back of the legs.

Large is the right call for a big double coat during a spring or autumn shed, when you are moving a lot of hair off a lot of surface.

Small is for cats, toy breeds, puppies, and for the detail work on every dog: ears, face, feet and leg feathering.

The technique does not change with the size. Part the coat with your free hand, place the pins at the skin, and draw outward in short strokes until nothing more lifts.

• Best for: Body work on every coat type, and as the first brush in any household.
• Why it works: Stainless pins in a flexing pad, available in three head sizes so the tool fits the areas that actually mat.
• Context: Medium if you are buying one. Large only as a body brush alongside something smaller.

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Flying Pawfect Curved Slicker Brush

The curved head follows the contour of a dog rather than sitting flat against it, which is what lets it reach into the hollows: the chest, the armpits, behind the ears and the back of the legs.

It has longer, softer pins than the flat version, which suits doodles and long-coated dogs where the pins have further to travel before they reach the skin.

Like the flat brush it comes in small, medium and large. A small curved head is the single most useful detail tool most owners can add, because it gets into the four places that mat first on almost every dog.

For a doodle or a long-coated dog, a medium curved brush for the body and a small for the face and legs covers the whole animal comfortably.

Use it the same way as the flat: sectioned, from the skin outward, short strokes, comb-check before moving on.

Keep the pins clear between sections. A clogged pad stops collecting, whatever size the head is.

• Best for: Doodles, long coats, contoured areas, and detail work in a small size.
• Why it works: The curve follows the body and the longer pins reach the skin through a deeper coat.
• Context: Small curved is the best second brush for almost any household.

Step by Step: Choosing Your Size

• Step 1. Find the smallest area you regularly need to reach. Usually behind an ear or under a front leg.
• Step 2. Ask whether a brush head would fit there comfortably with the dog standing normally.
• Step 3. If yes, that size will do the whole dog. If no, you need something smaller for those areas.
• Step 4. Consider the coat depth. A deep curly coat needs longer pins, which points to the curved version.
• Step 5. Consider how long you will be brushing. Daily twenty minute sessions during a shed favour a larger head on the body.
• Step 6. If in doubt, buy medium. It is the size that fails least often.

Once you have the right size, the technique is what makes it work, and it is set out in how to use a slicker brush and comb together.

When One Brush Is Enough

One brush is enough if you have a short or smooth coated dog, a small dog where one small head reaches everything, or a dog you keep clipped short so there is no deep coat to work through.

Two are worth having if you have a doodle or any curly coat, a large double coat, a long-coated breed with feathering, or several animals of different sizes.

A second brush is also worth it if any animal in the house has a skin condition, since brushes carry yeast and bacteria between coats and that animal should have its own.

Common Mistakes When Choosing a Brush Size

Buying by dog size. A big dog still has small ears, a narrow chest and awkward armpits.

Buying large for speed. Most of a proper grooming session is spent parting the coat, not stroking it, so the time saved is smaller than it looks.

Using a body brush on a face. Uncomfortable for the dog and imprecise for you, and it is how dogs learn to move away when you approach the head.

Assuming a small dog needs a small everything. A small dog with a thick coat still benefits from longer pins, which is a shape question rather than a size one.

Choosing size before checking build quality. A large brush with splaying pins is worse than a small one that works. What to look for is in how to choose a slicker brush that lasts.

Expecting the brush to do a comb's job. Whatever size you buy, you still need a steel comb to check the work.

FAQs

What size slicker brush for a big dog?

Large for the body during a shed, with a medium or small for the head, ears, chest and legs. The large head cannot reach the areas that actually mat.

What size for a cat?

Small, without exception. Cats have thin skin and short tolerance, and a small head gives you the control both of those require.

What size for a doodle?

Medium curved for the body and small curved for the face, ears and legs. Curly coats mat exactly where a large head cannot go.

If I buy one brush, which size?

Medium. It is workable on almost every dog and it is the size that fails least often.

Is a bigger brush faster?

Slightly, on the body. Most of a proper session goes on parting the coat rather than on the stroke, so the difference is smaller than people expect.

Can I use a small brush on a large dog?

Yes. It takes longer on the body but it reaches everything. The reverse is not true.

What is the difference between flat and curved?

A flat head covers ground on the body. A curved head follows the contour of legs, chest and face and has longer pins, which suits deeper and curlier coats.

Do I need a different brush for a puppy?

A small head is easier to handle on a wriggling puppy and less overwhelming, but the key thing is that the pins are finely finished. What the brush does to the coat is explained in what a slicker brush actually does to a coat.

Final Thoughts

Choose the head size by the smallest place you need to reach, not by how big the dog is. Medium is the answer for most single-brush households, and a small curved head is the best second brush almost anyone can add.

Whatever size you land on, the technique is the same: part the coat, brush from the skin outward in short strokes, and check the section with a comb before you move on.