Why Is My Labrador Losing Hair? What You Need to Know
Your Labrador’s thick, water-resistant coat is one of the breed’s defining features. So when you start noticing more fur than usual on your floors or bald patches on your dog’s skin, concern is natural. While Labradors are known shedders, excessive hair loss can signal an underlying health problem that needs attention.
What Normal Shedding Looks Like in Labs
Labradors have a double coat with two distinct layers. The outer coat consists of coarse, water-repellent guard hairs, while the undercoat is soft and insulating. This combination keeps them comfortable in various weather conditions, but it also means significant shedding.
Labs shed their undercoat twice yearly in spring and fall as seasons change. Each shedding period lasts 2 to 4 weeks, during which you’ll see dramatic increases in loose fur around your home. Regular brushing during these times helps, but the hair will still be noticeable.
Several factors influence normal shedding patterns beyond these seasonal cycles. Puppies shed their soft puppy coat around 4 to 6 months of age, which can look alarming to new owners. Female Labs often shed more during pregnancy, after giving birth, or during heat cycles due to hormonal changes. Some Labs also experience changes in coat texture and shedding patterns after being spayed or neutered.
When Shedding Becomes a Problem
If your Lab’s hair loss seems excessive, appears in patches, or doesn’t align with seasonal patterns, it’s time to investigate further. Here are the most common medical causes.
Allergies
Labs can develop three types of allergies, each causing itching and hair loss. Food allergies most commonly involve beef, dairy products, chicken, wheat, or soy. Environmental allergies stem from pollen, dust mites, mold, or certain fabrics. Flea allergy dermatitis occurs when a Lab reacts to flea saliva, causing intense itching and hair loss around the tail base and hindquarters.
Beyond hair loss, allergic dogs typically scratch constantly, develop red and inflamed skin, suffer frequent ear infections, or experience digestive issues. Identifying the specific allergen requires working with your veterinarian through elimination diets or allergy testing.
Parasites
External parasites create intense discomfort that leads to hair loss. Fleas are particularly problematic because many dogs react allergically to flea saliva, even from a single bite. Ticks and mites can also cause significant irritation.
Watch for excessive scratching, chewing, or biting at the skin. You might see actual fleas or tiny black specks of flea dirt on your dog’s skin. Scabs and secondary skin infections often develop when dogs scratch persistently. Year round parasite prevention is essential, not just during warmer months.
Infections
Bacterial and fungal infections damage the skin and cause hair loss. Yeast infections create an overgrowth of naturally occurring yeast on the skin, producing a distinctive musty odor along with itching and hair loss. Ringworm, despite its name, is a highly contagious fungal infection appearing as circular, scaly patches with hair loss. Bacterial infections often develop secondary to allergies or other skin conditions, causing redness, inflammation, and hair loss.
These infections require veterinary diagnosis and treatment. Ringworm is especially concerning because it spreads easily to other pets and humans in the household.
Hormonal Imbalances
Two main hormonal conditions disrupt normal hair growth in Labs. Hypothyroidism occurs when the thyroid gland produces insufficient thyroid hormone, causing hair loss primarily over the trunk, tail, and collar area while sparing the head and legs. Other symptoms include weight gain, lethargy, increased thirst and urination, and skin changes.
Cushing’s disease results from overproduction of cortisol, typically due to pituitary or adrenal gland tumors. Hair loss accompanies increased appetite, excessive drinking and urination, a pot-bellied appearance, and behavioral changes. Both conditions require blood tests for diagnosis and lifelong medication for management.
Stress and Anxiety
Psychological stress manifests physically in dogs. Moving to a new home, changes in family structure, loud noises, or disruptions to routine can trigger stress-related hair loss. Stressed Labs may also show decreased appetite, increased panting or drooling, destructive behavior, or changes in vocalization. Addressing the underlying stressors while providing stability helps resolve stress-related shedding.
Genetic Factors
Some Labradors inherit predispositions to skin conditions causing hair loss. Alopecia can manifest as symmetrical hair loss on the flanks, chest, and inner thighs. These genetic conditions may appear from birth or develop later in life. While you cannot prevent genetic conditions, early diagnosis helps manage symptoms.
Nutritional Deficiencies
Your Lab’s diet directly affects coat health. Deficiencies in essential fatty acids lead to dry skin and a dull, brittle coat that sheds excessively. Zinc deficiency causes crusty or scaly skin, especially around the face, ears, and paws, along with hair loss and poor wound healing. Other vitamins and minerals like copper, biotin, and vitamin E also play roles in maintaining healthy skin and coat.
Most commercial dog foods contain adequate nutrition, so deficiencies typically result from underlying health conditions affecting nutrient absorption rather than diet alone.
Getting a Diagnosis
When you notice abnormal hair loss, schedule a veterinary appointment. Your veterinarian will conduct a thorough physical exam, checking for parasites, skin lesions, and other abnormalities. Be prepared to discuss your dog’s diet, lifestyle, medications, recent environmental changes, and when you first noticed the hair loss.
Diagnostic tests may include skin scrapings to check for mites, fungal cultures to diagnose ringworm, blood tests to assess organ function and hormone levels, or elimination diet trials to identify food allergies. These tests help pinpoint the exact cause so treatment can begin.
Treatment Approaches
Treatment depends entirely on the underlying cause. Bacterial infections require antibiotics, while antifungals treat yeast infections and ringworm. Antihistamines or other medications help manage allergies, and hormone replacement therapy or other medications address hormonal imbalances.
Regular use of flea and tick preventives stops parasite infestations before they start. For food allergies, switching to a limited ingredient diet or eliminating problem proteins from your dog’s food provides relief. Elimination diets typically last 8 to 12 weeks to properly identify allergens.
Medicated shampoos and conditioners soothe irritated skin, control infections, and promote hair regrowth. For stress-related hair loss, identifying and minimizing stressors while maintaining a calm, predictable environment helps. Adding essential fatty acid supplements or other nutrients improves skin and coat health when deficiencies exist.
Hair regrowth takes time. Even with proper treatment, you may not see improvement for several weeks, and full coat regrowth can take 4 months or longer.
When to Call Your Veterinarian
Contact your veterinarian immediately if you notice sudden or excessive hair loss, bald patches or significant thinning, red, inflamed, or irritated skin, excessive scratching, licking, or biting at the skin, scabs, sores, or other skin lesions, or changes in appetite, energy level, or behavior.
Early intervention prevents complications and gets your Lab back to health faster.
Prevention Strategies
While you cannot prevent all causes of hair loss, these steps minimize risk. Feed a high quality, balanced diet appropriate for your Lab’s age and activity level. Brush your Lab regularly, 2 to 3 times weekly during normal periods and daily during heavy shedding seasons. This removes loose fur and distributes natural oils that keep the coat healthy.
Use year round flea and tick preventives as recommended by your veterinarian. These products work better as prevention than treatment. Schedule regular veterinary checkups so health issues can be caught early. Create a calm, predictable environment with plenty of exercise, mental stimulation, and affection to minimize stress.
Understanding what causes hair loss in Labradors helps you recognize problems early and seek appropriate care. With prompt veterinary attention and proper treatment, most Labs recover fully and maintain their beautiful, healthy coats throughout their lives.
