Course 13 · Matting and Tangles · Lesson 2 of 12
Where do mats form first, and why?
Mats form first where friction, moisture and fine hair meet, behind ears, armpits, groin, chest, collar areas and tail base.
Mats form first where friction, moisture and fine or long hair meet: behind the ears, in the armpits, in the groin, on the chest, under collars and harnesses, around the tail base, and between the toes. These areas move constantly, rub against each other or against equipment, trap moisture, and contain softer hair that tangles easily. Knowing these places lets owners check the right areas first, every time, rather than combing only the visible top coat and missing the mats forming underneath.
Why do friction areas mat first?
Friction is the main driver of matting, because it pushes hairs together and tightens tangles. Armpits rub with every step, groin folds rub when the dog moves and lies down, and the chest rubs against the front legs and against harnesses. Behind the ears, hair is fine and soft, and it rubs against the ear, the collar and the head when the dog shakes or scratches. Collar and harness areas rub constantly, and they also trap loose hair and moisture under straps. Tail base hair rubs against the body and bedding, and it collects debris. In each case, the combination is the same: movement plus contact plus loose hair equals tightening. Areas that are not friction areas, such as the flat top of the back in a short coated dog, mat far less often, because hairs there lie flat and move less. Owners who understand friction will check armpits and groin even when the back looks smooth, and will not be surprised when a mat is found in a place that is rarely seen.
What role do moisture, equipment and coat type play?
Moisture accelerates matting in friction areas. Rain, swimming, bathing without thorough drying, drooling, urine, and sweat from exercise all leave damp hair that felts as it dries. A dog that is bathed and left damp, or that wears a harness over a damp coat, is more likely to mat than a dog that is dried fully and combed after wetting. Equipment matters too: a collar that is too tight, a harness that rubs, a coat or jumper worn for long periods, and a lead that pulls hair can all create friction and trap hair. Coat type matters as well: long, curly, wavy and double coats trap shed hair more readily, and fine puppy coat mats faster than adult coat. Dogs in seasonal coat change, when undercoat is released in large amounts, are at higher risk, because loose undercoat packs into friction areas. Health matters too: a dog that scratches, licks, or lies in one position due to pain will mat faster in the areas it cannot reach or that stay pressed against bedding.
| Area | Why it mats first | Check by |
|---|---|---|
| Behind ears | Fine hair, rubbing, scratching | Fingers to skin, feel for clumps |
| Armpits | Movement, leg friction, moisture | Lift leg gently, feel and look |
| Groin | Folds, moisture, movement | Brief visual and fingertip check |
| Chest | Leg and harness friction | Comb and fingers to skin |
| Collar and harness lines | Constant rubbing, trapped hair | Remove equipment, feel underneath |
| Tail base and between toes | Rubbing, debris, dampness | Fingers, comb, visual check |
How should these areas be checked?
Check friction areas by feeling, not just by looking. Run fingers gently through the coat down to the skin, feeling for clumps, tightness or resistance. Use a comb in small sections, starting at the ends and working toward the skin, to find tangles before they tighten. Check behind ears by lifting the ear gently and feeling the hair underneath. Check armpits by lifting the front leg a little, with the dog standing comfortably, and feeling the hair in the fold. Check the groin briefly and respectfully, without pulling skin, and check the chest by parting the hair and feeling to the skin. Check under collars and harnesses by removing them and feeling the hair underneath, and check between toes during paw checks. Do these checks at least weekly for dogs prone to matting, and more often during shedding, wet weather, or after swimming. Keep the checks short and rewarded, so the dog accepts them, and record where mats or tangles are found repeatedly, because that pattern shows where prevention should focus.
How can friction area matting be reduced?
Reduce friction and moisture, and increase combing in the right places. Remove collars and harnesses when not needed, so hair is not constantly rubbed and trapped. Dry the dog fully after baths, rain and swimming, and comb friction areas while drying. Comb armpits, groin, chest and behind ears every few days, even if the rest of the coat is combed weekly. Keep toe hair and sanitary hair tidy, so debris does not pack into those areas. Choose equipment that fits well, without rubbing, and check the fit regularly as coat length changes. Avoid leaving coats or jumpers on indoors for long periods, especially on damp coats. These habits do not eliminate matting, but they reduce the friction and moisture that drive it, and they make checks more effective. Prevention is covered in full in lesson 11, but the principle is simple: the areas that move and rub most need the most attention, most often.
When should you stop and get help?
Stop home work and seek a groomer or vet if a mat in a friction area is tight against skin, if the skin is red, sore, broken or smelly, if the dog shows pain, or if mats are widespread. Do not pull mats in armpits or groin, where skin is thin and folds easily, and do not cut into mats in these areas without the decision process in lesson 6. A groomer can remove friction area mats safely and can show, in person, how to comb those areas without hurting the dog. Knowing where mats form first, and checking those places by feel every week, is the most effective early warning habit in coat care.
Behind ears, armpits, groin, chest and under equipment are where mats begin, and a weekly fingertip check in those places catches tangles while they are still easy to work out.
Further reading
- American Kennel Club, grooming guidance
- RSPCA, dog care advice