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Seasonal Allergies in Dogs

By the Dog Health Handbook team · Updated · Fact-checked against current veterinary references (see sources)

Key takeaways

  • Itching is the main sign of seasonal allergy in dogs, not sneezing.
  • Paws, face, ears, armpits and belly are the usual itchy areas.
  • Signs usually start between 6 months and 3 years of age.
  • Flea allergy also peaks in warm months, so strict flea control comes first.
  • Allergy can be controlled but not cured; most dogs need a long-term plan.

Table of Contents

Research Signs Causes Diagnosis At home Vet treatment FAQ Sources

Dog Allergy QuickLinks

Overview Symptoms Seasonal Food Eye Human Allergies to Dog

Seasonal allergies in dogs usually show up as itchy skin rather than sneezing. The most common form is environmental allergy, or atopic dermatitis: an inherited tendency to react to pollens, molds and dust mites.1,2,3 Dogs lick and chew their paws, rub their face, scratch their armpits and belly, and get repeated ear infections.2,1,4 Signs usually begin between 6 months and 3 years of age.1,2 Allergy can't be cured, but most dogs can be kept comfortable with a long-term plan.1,5

See your vet promptly if your dog:

  • Has swelling of the face, lips or throat, hives all over, or trouble breathing. This is an emergency.6,7
  • Has open sores, oozing or crusted skin, or a smell from the skin or ears, which can mean infection1,8
  • Is scratching so much they can't sleep, or have bitten their skin raw8,9
  • Has a head tilt, loss of balance or a painful ear10,11

Not sure why your dog is itchy?

Try our free Itchy Dog Checker. Answer 10 quick questions to see the likely causes to ask your vet about, and get a printable summary for your appointment.

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What the Research Says

  • Skin allergies top one insurer's dog claims. One large US insurer received more than 410,000 skin allergy claims for dogs in 2023, about 1 in 5 of its dog claims.12 Reliable figures for how many dogs have atopic dermatitis are scarce, and the often-quoted 3% to 15% isn't based on solid data.13
  • Dust mites are the most common trigger on blood tests. In a 2026 study of more than 21,000 US dogs tested for suspected allergy, about 80% reacted to house dust mites, and about 19% to tree pollens.14 A positive test shows exposure, not necessarily allergy.3,1
  • Itch affects behavior. In a UK study of 343 allergic dogs, more severe itching was linked to more chewing, excessive grooming, attention-seeking and excitability.15
  • Allergy shots help about 6 in 10 dogs. In a 2022 study of 664 dogs, 60% had a good or excellent response after at least 9 months.16

Signs of Seasonal Allergies in Dogs

Itching is the main sign.2 You may notice your dog:

  • Licking or chewing the paws2,4
  • Rubbing the face and eyes on furniture or the carpet2
  • Scratching the armpits, belly, groin or inner legs3,1
  • Shaking the head, or getting ear infections that keep coming back1,9 See dog scratching ears.
  • Red skin, hair loss, scabs, or darkened, thickened skin where they've scratched for a long time2,17

The feet, face, ears, front legs and belly are the most often affected areas.2 About 15% of allergic dogs also get a runny nose or asthma-like signs.2 Up to half of allergic dogs have ear inflammation, and in some dogs it's the only sign.9,1

Is it seasonal or year-round?

Some dogs itch only during pollen seasons, in spring, summer or fall. Many itch year-round, often because of house dust mites or food, with flare-ups in certain seasons.3,1,4 Flares can happen at any time of year.18 Breeds that are prone to atopic dermatitis include Boxers, Boston Terriers, Golden and Labrador Retrievers, Shih Tzus, Lhasa Apsos, West Highland White and Scottish Terriers, Dalmatians and Shar-Peis.1

What Causes Seasonal Itching?

  • Pollens: grasses, trees and weeds, which rise in spring and summer.19,18
  • Molds and dust mites, which can cause year-round itch. Even dogs that live indoors can develop allergies.19,3
  • Flea allergy: the most common summer look-alike. It peaks in late summer, and the itch is mostly over the lower back, base of the tail and back of the thighs. Highly allergic dogs may have few or no fleas you can see.20
  • Insect bites and contact allergy to things the skin touches, such as plants or cleaning products.1,21
  • Skin infections: bacteria and yeast thrive on allergic skin and keep the itch going, even after the season ends.1,8

Food allergy is a must-rule-out when itching happens all year, not only in certain seasons.22,3 Grains aren't the main problem. The most common food allergens in dogs are beef, dairy and chicken.23 See food allergies in dogs.

How Vets Diagnose Environmental Allergies

There's no single test that diagnoses atopic dermatitis. Vets make the diagnosis from the history and signs, and by ruling out other causes of itching.1,2,24

  1. Parasites first: fleas, mange mites and ear mites. Because flea allergy can look identical, vets often recommend strict flea control for every pet in the home, even if no fleas are seen.3,20,8
  2. Infections: skin and ear samples checked under the microscope (cytology).5,25
  3. Food: for year-round itch, a strict elimination diet for at least 8 weeks.3,24
  4. Allergy testing: skin (intradermal) or blood tests. These are used to choose the allergens for allergy shots, not to diagnose allergy. Healthy dogs can test positive, and 10% to 30% of allergic dogs test negative on skin tests.3,4,1

Diagnosis can take several visits. Guidelines suggest a referral to a veterinary dermatologist if itching still isn't under control by the third visit.5,9

What Helps at Home

  • Year-round flea control for every dog and cat in the home. Guidelines recommend it for all dogs with atopic dermatitis.26,20
  • Regular baths with a mild or medicated shampoo your vet recommends. How often and how thoroughly you bathe may matter most, and many allergic dogs do well with weekly baths.26,1,27 Use cool water and towel-dry, because heat can make itching worse.27
  • Wipe or rinse paws and belly after walks in high pollen season. This is expert advice, not tested in trials.19 Keep walking your dog: in one large study of Labrador and Golden Retrievers, dogs walked in woods, fields or beaches were less likely to have atopic dermatitis, though this doesn't prove cause.28
  • Air filters and regular cleaning may lower indoor allergens. Avoiding airborne allergens completely is almost impossible, though.19,1,24
  • Essential fatty acids (fish oil) can help a little over time as an add-on, but they take up to 2 months and won't stop a flare.26,1

Don't give human allergy medicines without your vet's advice. Some contain decongestants or sweeteners that are toxic to dogs.29,30,31

Vet Treatment for Seasonal Allergies

Most allergic dogs need more than one treatment at once, and the plan changes between flares and quieter times.5,32

  • Fast itch relief: a JAK inhibitor tablet, an anti-itch antibody injection or steroids. These work within hours to a few days.33,1
  • Steroid sprays for small areas during a flare.26
  • Treating infections, with medicated shampoos and sprays first for surface infections.25
  • Allergy shots or drops (immunotherapy), the only treatment aimed at the allergy itself. They take up to a year to judge, and many dogs stay on them for years.26,2,16

Antihistamines help only a minority of dogs.26,34 See allergy medicine for dogs for how each option compares, and dog allergies for an overview.

Allergy is lifelong, and flare-ups should be expected.5,1 It also affects owners: in one survey of allergic West Highland White Terriers, about half of owners said their own quality of life suffered.35 Dogs on allergy shots in one study scratched less and had better appetites.36

Frequently Asked Questions

What are the signs of seasonal allergies in dogs?

Itching, especially of the paws, face, ears, armpits and belly, plus licking, chewing, red skin and repeated ear infections.

When do dog seasonal allergies start?

Usually between 6 months and 3 years of age. Flares often follow pollen seasons in spring, summer or fall.

Can seasonal allergies in dogs be cured?

No, but they can usually be controlled with flea control, baths, itch medicines and allergy shots.

Do allergy tests diagnose seasonal allergies?

No. Vets diagnose allergy by ruling out other causes. Tests are used to choose allergens for allergy shots.

Why does my dog itch more in summer?

Pollen allergy and flea allergy both peak in warm months. Strict flea control for all pets is the first step.

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Sources and further reading

This article was rewritten and fact-checked on October 28, 2026 against current veterinary references and specialist guidelines:

  1. Hoff S. Atopic dermatitis in dogs. Merck Veterinary Manual, May 2026.
  2. White SD, Moriello KA. Allergies in dogs. Merck Veterinary Manual (pet owner version), 2024.
  3. Hensel P, Santoro D, Favrot C, Hill P, Griffin C. Canine atopic dermatitis: detailed guidelines for diagnosis and allergen identification. BMC Veterinary Research, 2015.
  4. Banovic F. Canine atopic dermatitis: updates on diagnosis and treatment. Today's Veterinary Practice, January/February 2018.
  5. Miller J, Simpson A, Bloom P, Diesel A, Friedeck A, Paterson T, Wisecup M, Yu C-M. 2023 AAHA management of allergic skin diseases in dogs and cats guidelines. Journal of the American Animal Hospital Association, 2023.
  6. White SD. Hives and rashes (urticaria) in dogs. Merck Veterinary Manual (pet owner version), 2024.
  7. Weir M, Hunter T, Ward E. Hives (urticaria) in dogs. VCA Animal Hospitals, 2022.
  8. Moriello KA. Itching (pruritus) in dogs. Merck Veterinary Manual (pet owner version), May 2025.
  9. American Board of Veterinary Practitioners. Allergic skin disease (summary of the 2023 AAHA guidelines). ABVP, September 2024.
  10. Roman N. Otitis Media and Interna in Dogs. Merck Veterinary Manual (pet owner version), reviewed April 2026.
  11. Cornell Richard P. Riney Canine Health Center. Itchy ear problems.
  12. Nationwide. Skin allergies, gastrointestinal disease among most common conditions that prompt veterinary visits. Nationwide news release, April 24, 2024.
  13. Drechsler Y, Dong C, Clark DE, Kaur G. Canine atopic dermatitis: prevalence, impact, and management strategies. Veterinary Medicine: Research and Reports, 2024.
  14. Olivry T, Mas-Fontao A. Molecular allergen sensitization profiling in a large cohort of dogs suspected of allergic diseases in the USA: prevalence and unsupervised IgE clustering (2024 to 2025). Animals, 2026.
  15. Harvey ND, Craigon PJ, Shaw SC, Blott SC, England GC. Behavioural differences in dogs with atopic dermatitis suggest stress could be a significant problem associated with chronic pruritus. Animals, 2019.
  16. Fennis EEM, van Damme CMM, Schlotter YM, et al. Efficacy of subcutaneous allergen immunotherapy in atopic dogs: a retrospective study of 664 cases. Veterinary Dermatology, 2022.
  17. Moriello KA. Primary Acanthosis Nigricans and Postinflammatory Hyperpigmentation in Dogs. Merck Veterinary Manual, updated January 2025.
  18. AAHA Trends. From the guidelines: allergic skin diseases in canines. American Animal Hospital Association.
  19. Wong L. Furst aid: allergies in dogs and cats. Carlson College of Veterinary Medicine, Oregon State University.
  20. Gentry C. Flea allergy dermatitis in dogs and cats. Merck Veterinary Manual, April 2026.
  21. Torres SMF. Contact allergy and Canine sarcoptic mange. In: Small and Large Animal Dermatology Handbook. University of Minnesota open textbook, 2025.
  22. Olivry T, Mueller RS. Critically appraised topic on adverse food reactions of companion animals (3): prevalence of cutaneous adverse food reactions in dogs and cats. BMC Veterinary Research, 2017.
  23. Mueller RS, Olivry T, Prélaud P. Critically appraised topic on adverse food reactions of companion animals (2): common food allergen sources in dogs and cats. BMC Veterinary Research, 2016.
  24. Mueller RS. Allergy Testing in Practice: Is It Worth It? European Veterinary Conference Voorjaarsdagen, Amsterdam, 2010 (IVIS).
  25. Loeffler A, Cain CL, Ferrer L, et al. Antimicrobial use guidelines for canine pyoderma by the International Society for Companion Animal Infectious Diseases (ISCAID). Veterinary Dermatology, 2025.
  26. Olivry T, DeBoer DJ, Favrot C, et al. Treatment of canine atopic dermatitis: 2015 updated guidelines from the International Committee on Allergic Diseases of Animals (ICADA). BMC Veterinary Research, 2015.
  27. Nesbitt GH. CVC highlights: bathing key to managing pruritus in dogs and cats. dvm360, October 2005.
  28. Harvey ND, Shaw SC, Craigon PJ, Blott SC, England GC. Environmental risk factors for canine atopic dermatitis: a retrospective large-scale study in Labrador and golden retrievers. Veterinary Dermatology, 2019.
  29. Pet Poison Helpline. Seasonal Allergy Medications Pose a Deadly Risk to Pets. Pet Poison Helpline, May 26, 2021, modified May 2026.
  30. Pet Poison Helpline. Decongestants. Pet Poison Helpline, updated May 29, 2026.
  31. ASPCA. Can human allergy medication be harmful to pets? Our experts explain. ASPCA, April 2026.
  32. Lederhouse C, Larkin M. AAHA publishes allergic skin disease guidelines for dogs, cats. AVMA News, November 2023.
  33. American Animal Hospital Association. Antipruritic and anti-inflammatory medications for dogs (Table 1, 2023 AAHA allergic skin disease guidelines).
  34. Hsiao YH, Chen C, Willemse T. Effects of an oral antihistamine in dogs with chronic atopic dermatitis: a randomized, double blind, placebo-controlled trial. Journal of Veterinary Science, 2016 (title shortened to the drug class).
  35. Science for Animal Welfare (UFAW). Canine atopic dermatitis: West Highland White Terrier.
  36. Kotnik T. Quality of life of allergic dogs treated with allergen-specific immunotherapy: a retrospective study. Veterinary Sciences, 2023.

About this article

Last updated : fully rewritten using the 2015 ICADA international guidelines, the 2023 AAHA allergic skin disease guidelines, the Merck Veterinary Manual, Today's Veterinary Practice, Oregon State University, IVIS proceedings and studies published 2019 to 2026; added the research summary, signs, causes, diagnosis, home care, vet treatment, key takeaways and FAQ.

This page is for general information and is not a substitute for an exam by your veterinarian.