Dog Hair Loss
Noticing bald spots, thinning fur, or extra shedding can be upsetting. Here's how to tell what may be causing your dog's hair loss, what you can safely do at home, and when it's time to call a vet.
When to call a vet for dog hair loss
Go to the ER now
- ● Go to an emergency vet now if the hair loss is paired with facial swelling, hives, trouble breathing, collapse, or severe weakness.
- ● Seek urgent emergency care if the skin is badly burned, bleeding heavily, or there is sudden widespread skin peeling or open, painful wounds.
- ● Go in right away if your dog seems extremely painful, cries when touched, or has a rapidly worsening rash with fever or lethargy.
- ● Get emergency help if your dog may have been exposed to a toxic chemical, caustic product, or medication and now has hair loss, skin damage, drooling, vomiting, or trouble breathing.
See a vet within 24 hours
- ● Call your vet within 24 hours if your dog has bald patches, thinning fur, or hair loss that is getting worse over days to weeks.
- ● Make a prompt appointment if your dog is also itchy, chewing, licking, shaking the head, or rubbing enough to damage the skin.
- ● See your vet soon if the skin looks red, crusty, scabby, greasy, smelly, darkened, or has pimples, pustules, or discharge.
- ● Call your vet if hair loss is symmetrical on both sides, if the coat is slow to regrow after clipping, or if there are changes like weight gain, potbelly, increased thirst, or low energy.
- ● Book a vet visit promptly if anyone in the home has ring-shaped skin lesions or your dog has circular hairless, scaly patches, because some fungal infections can spread to people.
Watch at home, call if it worsens
- ● You can monitor briefly if your dog is acting normal and there is only very mild thinning from seasonal shedding with no bald spots, itching, redness, or skin irritation.
- ● Monitor a small area of friction-related thinning, such as under a collar or harness, if the skin looks normal and your dog is comfortable, but remove the source of rubbing.
- ● Keep an eye on mild mat-related thinning after grooming if the skin underneath is not red, moist, painful, or infected.
- ● Even mild hair loss should be discussed with your vet if it lasts more than 1 to 2 weeks, spreads, or new skin changes appear.
Common Causes of Dog Hair Loss
Parasites and flea allergy
Fleas, mites, and other parasites can make dogs intensely itchy, leading to scratching, chewing, and broken hair. Flea allergy commonly causes hair loss around the tail base, neck, and head.
Skin infections
Bacterial, yeast, and fungal infections can damage hair follicles and inflame the skin. Ringworm can cause hair loss with scaling or crusting and may spread to people.
Allergies and itchiness
Environmental or food allergies often cause itching, licking, and chewing that can pull hair out over time. Dogs may also have red skin, ear problems, or recurring hot spots.
Hormonal or endocrine disease
Conditions like hypothyroidism and Cushing's disease can cause thinning hair or symmetrical bald areas, often with other body-wide signs such as lethargy, weight changes, thirst changes, or thin skin.
Friction, grooming, or coat damage
Poorly fitted collars, chronic rubbing, severe matting, or over-grooming can lead to localized hair loss. Some plush-coated dogs can also have delayed regrowth after clipping.
Genetic, breed-related, or nutritional problems
Some dogs develop inherited alopecias or coat disorders, while poor nutrition can affect skin and coat quality. These cases still need a veterinary exam because many look similar at home.
What to Do at Home
Hair loss is a symptom, not a diagnosis, so home care should focus on protecting your dog's skin and gathering details for your vet. Avoid trying random shampoos, over-the-counter creams, or human medications, since some can make skin disease worse or delay a proper diagnosis.
- Check the skin closely in good light for redness, scabs, scaling, moisture, odor, fleas, or areas your dog keeps licking or chewing.
- Prevent self-trauma with an e-collar or soft recovery collar if your dog is scratching or chewing enough to create sores.
- Keep the area clean and dry, and avoid harsh bathing or using products not labeled for dogs unless your vet recommends them.
- Remove sources of rubbing such as tight collars, harnesses, or matted fur, but do not cut close to the skin with scissors.
- Take clear photos and note when the hair loss started, whether it is itchy, and whether your dog has other signs like thirst changes, weight changes, low energy, or ear/skin infections.
- Call your vet if the area spreads, looks infected, becomes painful, or your dog seems uncomfortable or unwell.
Frequently asked questions about hair loss in dogs
Why is my dog losing hair in patches?
Can allergies cause hair loss in dogs?
Is hair loss in dogs an emergency?
Can ringworm cause hair loss in dogs?
Will my dog's hair grow back?
Disclaimer: The information provided in this article is for educational purposes only and does not constitute veterinary medical advice. Reading this content does not establish a veterinarian-client-patient relationship. Every pet is different — always consult a licensed veterinarian before making decisions about your pet's health, diet, or care. If you'd like personalized guidance, you can talk to one of our vets. If your pet is experiencing a medical emergency, contact your local emergency animal hospital immediately.