What “Blowing Coat” Means — and How Long It Lasts
"Blowing coat" is what groomers call the stretch when a double-coated dog sheds its soft undercoat in bulk rather than gradually. It isn't a condition and it isn't a problem — it's the seasonal changeover, and it's why a Husky can produce a carrier bag of fluff in a week. It typically runs a few weeks to a couple of months, most often in spring and fall.
Blowing coat runs a few weeks to a couple of months, typically 2 seasons a year — spring and fall — in double-coated breeds.
What is actually being shed
A double coat is two coats doing two jobs. AKC describes it directly: "The outermost layer is a harsh topcoat made of long, coarse hairs," and "Beneath it sits a soft, dense undercoat made of shorter secondary hairs, sometimes called wool." The topcoat "helps repel dirt and water while protecting the skin from the environment"; the undercoat "provides insulation during colder months by trapping warmth close to the body."
The two layers shed on different schedules. Guard hairs turn over slowly and continuously; the undercoat is the seasonal one, shedding most during seasonal changes — a period AKC notes is "commonly called 'blowing coat.'" So the tufts coming out are almost entirely the wool layer. You'll see it clearly in Labradors, Corgis, Border Collies, Australian Shepherds, Newfoundlands, Samoyeds and Alaskan Malamutes — and in heavy-coated breeds like the Great Pyrenees, where one session rarely gets through the whole dog.
One thing not to do about it: shave. AKC is explicit that "Shaving a double coat removes both the undercoat and topcoat. Because the two layers grow back at different rates, the undercoat may outpace the topcoat as it regrows, creating an uneven coat that no longer functions properly."
How long it lasts, and when
"Shedding season usually lasts a few weeks to a couple of months," per AKC. "The exact timing depends on breed, coat type, and environmental factors like temperature and daylight." Timing follows the seasons — "the heaviest shedding usually occurs in spring and fall." Spring drops the winter undercoat; fall clears the summer one to make room for insulation.
Climate moves the pattern more than people expect. Dogs in colder places may blow coat only twice a year; dogs in warmer regions can shed four times a year or nearly constantly, which is why an indoor dog in a heated, artificially-lit house often has no clean start and finish at all. For autumn timing specifically, see when fall shedding starts and how long it lasts.
Getting through the weeks
The only lever that works is taking the undercoat off before it lands. AKC's guidance during a heavy shed: dogs that shed heavily "may need brushing several times a week or even daily during peak shedding periods." Cadence in full: how often to brush during coat blow.
Tool choice matters more now than at any other point in the year, because a surface brush can't reach the layer that's shedding. AKC's note on rakes is the operative one: they "penetrate through to the undercoat to remove loose fur," and "you must choose the correct pin length for your dog's coat length."
| Tool type | Working spec | Reaches | Best during a blow |
|---|---|---|---|
| Undercoat rake, dual-sided | 9 wide teeth / 17 close teeth, 2.8 in (7 cm) head | Down into the undercoat | Yes — the main tool |
| Curved deshedding blade | 115 fine teeth on a 4.5 in (11.5 cm) tooth bar; 0.3 in (0.8 cm) gentle face, 0.16 in (0.4 cm) firm face | Loose undercoat near the surface | Yes — fast bulk removal |
| Slicker brush | Short, closely-set pins | Topcoat and light tangles | Finishing, not bulk |
| Comb | Solid teeth | Checks what you missed | Verification pass |
Source: product specifications for Fido Fave GT024 and GT051; tool categories per AKC, "Dog Brushes: How to Choose the Right Dog Brush."
Our dual-sided undercoat rake splits those two jobs onto one head: nine wide-set stainless teeth to open mats, seventeen closer-set teeth to comb out loose undercoat, on an extra-wide 2.8 in (7 cm) head. Work with the direction of hair growth — never against it, never pulling through a knot. If the undercoat comes out faster than a rake can carry it, a curved deshedding blade moves more per pass; which suits which coat is compared directly in undercoat rake vs deshedding blade. If the rake itself is new to you, start with what an undercoat rake is; for the wider choice at this time of year, best deshedding tools for coat-blow season — or browse the full range of dog brushes and deshedding tools.
Outside the blow, AKC's baseline for double-coated dogs is "at least weekly brushing." Keeping that up between seasons makes the next blow shorter, because less dead undercoat is banked up waiting to come out at once.
One caveat worth stating plainly: a blow is a lot of hair, but it's even hair loss across the whole coat. Patchy bald spots, red or inflamed skin, persistent scratching or a bad smell are not part of it — those are a vet visit, not a brushing problem.
Frequently Asked Questions
Q: Do all dogs blow coat?
A: No. It's specific to double-coated breeds — the ones with a separate insulating undercoat. Single-coated dogs shed, sometimes heavily, but they have no wool layer to release in bulk, so there's no season with a clear start and end.
Q: Can I speed it up?
A: You can't change the biology, but you can move the timeline of your own housework. Brushing daily through the peak takes the undercoat off in one place rather than over three weeks of furniture. A bath and a thorough dry loosens a lot at once, which is why groomers pair the two.
Q: My dog is blowing coat in January. Is something wrong?
A: Probably not. Indoor heating and artificial light blur the seasonal cues, and dogs in warmer climates shed year-round rather than in two bursts. If the coat quality itself is changing — thinning, bald patches, dull or brittle hair — raise it with your vet.
Sources
- American Kennel Club — Double-Coated Dog Breeds: Care, Grooming, and Shedding (https://www.akc.org/expert-advice/dog-breeds/double-coated-dog-breeds/)
- American Kennel Club — Dog Shedding: When Dogs Shed Most and How to Manage It (https://www.akc.org/expert-advice/health/managing-dog-shedding/)
- American Kennel Club — Dog Brushes: How to Choose the Right Dog Brush for Your Pet (https://www.akc.org/expert-advice/health/types-dog-brushes-shedding/)