All Dogs Shed — But Not All Shedding Is the Same
Shedding is a perfectly natural process in which old or damaged hair falls out to make way for new growth. Every dog with fur sheds to some degree, even breeds often marketed as non-shedding. Understanding what normal shedding looks like for your specific dog makes it much easier to notice when something has changed.
The amount and pattern of shedding varies widely depending on breed, coat type, age, hormonal status, and the time of year. Getting familiar with your dog's typical pattern is one of the most practical things you can do as an owner, because changes in shedding are often one of the earliest external signs that something is not right internally.
Normal Shedding Patterns
Dogs typically shed most heavily in spring and autumn. The spring shed helps them lose the thick winter undercoat before warmer months; the autumn shed removes the lighter summer coat and prepares for the growth of a denser winter coat. This seasonal pattern is regulated by photoperiod — the number of daylight hours — rather than temperature, which explains why indoor dogs often shed more consistently throughout the year regardless of season. Artificial lighting disrupts the light cues that normally drive cyclical shedding.
Double-coated breeds such as Huskies, Samoyeds, Labrador Retrievers, and Bernese Mountain Dogs experience what is sometimes called "blowing coat" — a dramatic shedding event during which the undercoat releases in large clumps over a period of two to four weeks. This can look alarming, but for these breeds it is entirely expected twice a year.
Single-coated breeds and hairless breeds shed far less. Poodles, for example, have a single coat of continuously growing hair rather than fur with a defined growth cycle, which is why they shed minimally and require regular clipping.
Nutritional Causes of Excessive Shedding
Nutrition is one of the most significant and frequently overlooked factors in coat health. The hair follicle is a metabolically active structure that requires a steady supply of protein, essential fatty acids, vitamins, and minerals to produce healthy, well-anchored hair.
Protein deficiency is a leading dietary cause of excessive shedding. Hair is made almost entirely of keratin — a structural protein — so inadequate protein intake directly impairs hair production and retention. This is sometimes seen in dogs fed low-quality commercial diets where the primary protein sources are of poor bioavailability.
Omega-3 and omega-6 fatty acid deficiency produces a characteristic dull, brittle coat with increased shedding and flaking skin. Adding a high-quality fish oil supplement — providing EPA and DHA — can produce noticeable improvements in coat quality within six to eight weeks in nutritionally deficient dogs. However, supplementing without addressing an underlying dietary imbalance is less effective than transitioning to a nutritionally complete, balanced diet.
Zinc deficiency, biotin deficiency, and deficiencies in vitamins A and E can all contribute to hair loss and poor coat condition. These are less common in dogs fed complete commercial diets but can appear in dogs on home-cooked or raw diets that have not been properly formulated.
Medical Causes You Should Not Ignore
When shedding increases significantly beyond a dog's normal baseline, or when hair loss becomes patchy, asymmetrical, or accompanied by other symptoms, a medical cause should be investigated. The most important conditions to rule out include:
- Hypothyroidism — an underactive thyroid gland is one of the most common endocrine disorders in dogs and typically causes bilateral, symmetrical hair loss, weight gain, lethargy, and a dull coat. It is diagnosed with a blood test and managed with daily medication.
- Hyperadrenocorticism (Cushing's disease) — overproduction of cortisol by the adrenal glands causes a characteristic pot-bellied appearance alongside hair thinning, increased thirst and urination, and recurrent skin infections.
- Seasonal flank alopecia — a benign condition in which certain breeds develop symmetrical patches of hair loss on the flanks, typically in winter. It resolves spontaneously in most cases.
- Ringworm (dermatophytosis) — despite the name, this is a fungal infection rather than a parasitic one. It causes circular patches of hair loss, often with a scaly or crusty border, and is contagious to other animals and humans.
- Mange — both sarcoptic and demodectic mange cause hair loss and intense itching or skin thickening. These are diagnosed by skin scraping and require specific treatment.
- Allergies — whether environmental, food-related, or contact allergies, chronic inflammation of the skin disrupts the hair follicle and leads to increased shedding, particularly in areas the dog scratches or licks repeatedly.
When to Book a Veterinary Appointment
Shedding alone, even heavy seasonal shedding, does not require a vet visit if the coat regrows normally and the dog appears healthy. The following signs warrant a professional evaluation:
- Hair loss that is patchy, asymmetrical, or confined to specific body regions
- Skin that is visible through the coat where it previously was not
- Shedding accompanied by itching, redness, scaling, or pustules
- Hair loss alongside changes in behaviour, appetite, thirst, or body weight
- Coat that regrows poorly or not at all after a shedding episode
- Any sudden and dramatic change from the dog's usual pattern
Managing Normal Shedding at Home
For dogs experiencing normal seasonal shedding, regular brushing is the most effective management tool. Brushing removes loose dead hair before it falls onto furniture and flooring, stimulates the skin and follicles, distributes natural oils through the coat, and gives you the opportunity to notice any skin changes early.
Frequency depends on coat type. During peak shedding, even short-coated breeds can benefit from daily brushing. A professional de-shedding treatment from a groomer, which typically involves a high-velocity dryer and thorough brushing, can dramatically reduce the duration and volume of a coat blow in double-coated breeds.
Maintaining a balanced, species-appropriate diet and ensuring adequate hydration are the two most impactful things you can do between grooming sessions to support a healthy coat year-round.