Why Is My Dog Shedding Big Clumps of Hair?

Normal Shedding vs. Problematic Hair Loss

Dogs naturally shed hair as part of a growth cycle. Each hair follicle goes through phases: growth (anagen), rest (catagen), and shedding (telogen). When shedding occurs, old hair is pushed out by new hair. Most dogs shed at least once a year, with many experiencing heavier shedding in spring and fall.

The main trigger for shedding is not temperature, but daylight length. Longer days in spring and shorter days in fall signal coat changes. Dogs living indoors may shed year-round due to artificial lighting. Breeds with double coats—like Labrador Retrievers—often shed in a patchy or mosaic pattern, which can look alarming but is normal.

Hormonal and Life Stage Triggers

Major shedding can follow hormonal changes. Female dogs often shed heavily 6 to 8 weeks after giving birth or 10 to 12 weeks after a heat cycle. This is due to hormonal swings and is considered normal. The coat may appear moth-eaten during this time, but it’s part of the natural renewal process.

These shedding episodes are not signs of illness unless they’re accompanied by skin irritation, bald patches, or excessive itching.

Breed Differences and Coat Types

Not all dogs shed the same way. Breeds like Poodles, Bedlington Terriers, and Kerry Blue Terriers have nonshedding, curly coats. Their loose hair stays on the body and forms mats instead of falling off.

Double-coated breeds—such as Labs—have a soft undercoat and coarse outer guard hairs. The undercoat sheds first, often in large clumps, giving a patchy look. This is normal and expected. Short, straight hair (like in Labs) tends to weave into carpets and fabrics, making it harder to clean.

When Shedding Might Be a Health Warning

If shedding is sudden, patchy, or includes red, inflamed skin or intense itching, it may signal a health issue. Possible causes include: - Allergies (food or environmental) - Parasites (fleas, lice, or mange) - Ringworm (a fungal infection) - Hormonal disorders like hypothyroidism or Cushing’s syndrome

Poor coat quality—dull, dry, brittle hair—can also indicate systemic illness. A vet check is recommended if you notice these signs.

How to Manage and Reduce Shedding

Daily brushing is the most effective way to manage shedding. It removes loose hair before it ends up on your furniture. For double-coated breeds, brush both with and against the grain to loosen undercoat hair.

Bathing can also help—especially before brushing—since water loosens dead hair. Use a conditioner to keep the coat healthy. Avoid shaving double-coated dogs, as it removes their natural protection from sun and cold.

Improve your dog’s diet with adequate protein and essential fatty acids (like flax oil or fish oil). This can reduce shedding and improve coat quality.