Allergic Dermatitis in Dogs: Causes, Signs & Treatment
Is your dog constantly scratching, licking, or biting their skin? Allergic dermatitis is one of the most common skin conditions in dogs.
Allergic dermatitis is an inflammatory skin condition caused by your dog's immune system overreacting to allergens. It's one of the most common reasons dogs visit the vet, and it can make your pet miserable if left untreated.
Key Points
- Allergic dermatitis affects up to 10% of dogs worldwide
- Common triggers include food, pollen, dust mites, and flea saliva
- Signs include excessive scratching, red skin, ear infections, and hot spots
- Treatment depends on the cause but often includes medication and lifestyle changes
- Most dogs with allergic dermatitis can live comfortably with proper management
- Early treatment prevents secondary infections and improves quality of life
What Causes Allergic Dermatitis?
The most common triggers are environmental allergens like pollen, mold, and dust mites. Food allergies — particularly to proteins like chicken, beef, or dairy — are another major cause. Flea allergy dermatitis, where a single flea bite can cause a severe reaction, is also extremely common in Macau's warm climate.
How to Recognize the Signs
The hallmark sign is excessive itching, especially around the face, ears, paws, and belly. You may notice your dog licking their paws obsessively, rubbing their face on furniture, or scratching until the skin is red and raw. Recurring ear infections are often a sign of underlying allergies. Some dogs develop hot spots — moist, painful areas of inflamed skin.
Treatment Options
Treatment depends on the cause. For environmental allergies, your vet may prescribe antihistamines, medicated shampoos, or newer medications like oclacitinib (Apoquel) or lokivetmab (Cytopoint). Food allergies require an elimination diet to identify the trigger. Flea allergy dermatitis needs aggressive flea prevention. In severe cases, immunotherapy (allergy shots) may be recommended.
Living With Allergies
Most dogs with allergic dermatitis can live happy, comfortable lives with ongoing management. Regular bathing removes allergens from the skin, and keeping your home clean reduces exposure. Your vet will work with you to find the right combination of treatments for your dog's specific triggers.
When to See a Vet Immediately
- Your dog is scratching constantly and can't stop
- You notice red, swollen, or oozing skin
- There's a strong smell coming from the ears or skin
- Your dog has lost patches of fur
- Hot spots (moist, painful areas) develop suddenly
- Your dog seems miserable or is losing sleep from itching
How RVC Can Help
At RVC, our veterinary team can diagnose the specific cause of your dog's skin allergies through allergy testing and elimination diets. We offer the latest treatments including Cytopoint injections and Apoquel, along with medicated baths and ongoing management plans. Call us at +853 6677 6611.
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.