Signs of Allergies in Dogs: How to Tell If Your Dog Has Allergies

How to Tell If Your Dog Has Allergies

Allergies are one of the most common health conditions in dogs — and one of the most frequently misdiagnosed. The symptoms overlap with many other conditions, and dogs can't tell you what's bothering them. Here are the 12 most telling signs that your dog may have allergies.

12 Signs of Allergies in Dogs

1. Excessive Scratching

Scratching that goes beyond normal grooming — especially focused on the face, ears, armpits, groin, or paws — is the hallmark sign of allergies. If your dog is scratching to the point of breaking skin, it needs attention.

2. Paw Licking and Chewing

Obsessive licking or chewing of the paws — especially between the toes — is a classic allergy sign. The paws often turn reddish-brown from saliva staining. This is commonly caused by environmental allergens (pollen, grass) that collect on the paws.

3. Red, Inflamed Skin

Allergic skin (atopic dermatitis) appears red, irritated, and inflamed — especially in skin folds, armpits, groin, belly, and around the face. The skin may feel warm to the touch.

4. Hair Loss or Bald Patches

Chronic scratching, licking, and chewing damages the hair follicles, leading to hair loss. Bald patches are common on the paws, legs, belly, and around the eyes and mouth.

5. Recurring Ear Infections

Allergies are the #1 underlying cause of chronic ear infections in dogs. If your dog gets ear infections repeatedly, allergies are almost certainly involved. Signs include head shaking, ear scratching, odor, and dark discharge. See our guide on how to treat dog ear infection at home.

6. Watery or Red Eyes

Environmental allergens can cause conjunctivitis-like symptoms — watery, red, or goopy eyes. See our guide on how to treat dog eye infection at home.

7. Runny Nose or Sneezing

Less common than in humans, but some dogs with environmental allergies develop a runny nose or frequent sneezing, especially during high pollen seasons.

8. Hot Spots

Hot spots (acute moist dermatitis) are red, moist, painful skin lesions that develop rapidly from constant licking and scratching. They're a common complication of allergies. See our guide on how to treat dog hot spots at home.

9. Skin Rashes or Hives

Raised bumps, hives, or rashes — especially appearing suddenly after exposure to something new — indicate an allergic reaction. Hives that appear with facial swelling are a potential anaphylaxis emergency.

10. Digestive Upset

Food allergies often present with gastrointestinal symptoms: chronic diarrhea, vomiting, gas, or loose stools. If your dog has both skin symptoms and digestive issues, food allergy is a strong possibility. See our guide on how to treat dog food allergies.

11. Scooting or Anal Itching

Allergies can cause itching around the rear end, leading to scooting. This can also indicate anal gland issues, so a vet check is warranted if scooting is frequent.

12. Seasonal Pattern

If symptoms flare up at the same time each year — spring, summer, or fall — environmental/seasonal allergies are the likely cause. Year-round symptoms suggest food allergies, dust mites, or mold.

Types of Dog Allergies and Their Typical Signs

• Environmental/seasonal: Itching, paw licking, watery eyes, sneezing — worse in certain seasons
• Food allergies: Itching + digestive upset, year-round, often affects face and paws
• Flea allergy: Intense itching at the base of the tail, hair loss on hindquarters
• Contact allergy: Rash or irritation where skin contacts the allergen (belly, paws)

Home Treatment for Dog Allergies

💊 Recommended: StrellaLab Dog Allergy Relief & Anti Itch Support Chews — Omega-3, fish oil, pumpkin, and enzymes for skin and immune support. Made in USA, 60 chews.

See our full guide on how to treat dog allergies at home for a complete treatment plan covering all allergy types.

When to See a Vet

• Symptoms are severe or rapidly worsening
• Open sores, bleeding skin, or secondary infections
• Facial swelling or difficulty breathing (anaphylaxis — emergency)
• No improvement after 2–3 weeks of home care
• Recurring ear infections (need prescription treatment)