Ask Dr. Rene'
The Allergy Learning Center
Itching is one of the most common reasons dogs visit the veterinarian. These articles walk through what causes it, how it's diagnosed, and what actually helps.
23 partsAbout 222 minutes of reading
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Part 1: Is My Dog Itchy Because of Allergies?
Itching is a symptom, not a diagnosis. Learn how veterinarians work through every possible cause of an itchy dog — allergies, parasites, infections, and more.
Start the seriesYour learning path
23 parts, grouped into 6 chapters — read straight through or jump to the chapter you need.
Chapter 1 · Parts 1–3Understanding Your Dog's Allergies
Start with the basics: what allergies are, why they cause itching, and the different types of allergies dogs can develop.
- 1Part 1 of 23Is My Dog Itchy Because of Allergies?Itching is a symptom, not a diagnosis. Learn how veterinarians work through every possible cause of an itchy dog — allergies, parasites, infections, and more.
- 2Part 2 of 23Why Is My Dog So Itchy? Understanding the Science Behind Allergic Skin DiseaseWhat actually happens beneath the surface of your dog's skin — the allergic cascade, the skin barrier, and the itch-scratch cycle explained.
- 3Part 3 of 23The Three Types of Allergies in DogsFlea allergy dermatitis, environmental allergies, and food allergies — how they differ, how they overlap, and why the distinction changes treatment.
Chapter 2 · Parts 4–7What Allergies Look Like
Learn how allergies commonly show up through the ears, paws, skin, hot spots, and secondary infections.
- 4Part 4 of 23Why Does My Dog Keep Getting Ear Infections?Recurring ear infections are usually a symptom — not the real problem. Learn how allergies, yeast, bacteria, and ear anatomy drive the cycle, and how to break it.
- 5Part 5 of 23Why Does My Dog Keep Licking Their Feet?Allergies, yeast, pain, foreign bodies, and anxiety all cause paw licking. Learn what the pattern of licking tells your veterinarian.
- 6Part 6 of 23Why Did My Dog Suddenly Develop a Hot Spot?Hot spots can appear seemingly overnight. Learn what causes acute moist dermatitis, why hot spots spread so quickly, and how veterinarians treat them.
- 7Part 7 of 23Why Does My Dog Keep Getting Skin Infections?Understanding bacterial and yeast skin infections in dogs — why pyoderma and Malassezia keep coming back, and what skin cytology reveals.
Chapter 3 · Parts 8–13Medications & Itch Control
Understand the medications and supportive therapies veterinarians may use to control itching and inflammation.
- 8Part 8 of 23Why Do Steroids Work So Well—And Why Don't Veterinarians Want to Depend on Them?Understanding prednisone, dexamethasone, and steroid injections for dogs with allergies — why they work so fast, and why repeated use carries risk.
- 9Part 9 of 23Apoquel® for Dogs: Everything Pet Owners Should KnowHow Apoquel works, how fast it controls itching, side effects, safety and cancer questions, and how veterinarians decide when to use it.
- 10Part 10 of 23Cytopoint® for Dogs: Everything Pet Owners Should KnowHow Cytopoint works, how quickly it may relieve itching, how long it lasts, its safety profile, and when veterinarians recommend it.
- 11Part 11 of 23Apoquel® vs. Cytopoint®: Which Allergy Treatment Is Right for My Dog?Apoquel and Cytopoint both treat allergic itching in dogs, but they work differently. How veterinarians compare them, when each may be preferred, and when they may be used together.
- 12Part 12 of 23Why Benadryl® Usually Doesn't Work for Itchy DogsAntihistamines still have important uses in veterinary medicine, but most dogs with chronic environmental allergies need more. Why Benadryl disappoints, and when it does help.
- 13Part 13 of 23Do Omega-3 Fatty Acids Really Help Dogs with Allergies?Fish oil won't cure allergies or stop itching overnight, but it can support a healthier skin barrier over time. How EPA and DHA work, how long they take, and why dosing matters.
Chapter 4 · Parts 14–18Finding & Treating the Underlying Allergy
Explore how veterinarians investigate allergy triggers and address the underlying causes of recurring symptoms.
- 14Part 14 of 23Allergy Testing for Dogs: What It Can—and Can't—Tell YouAllergy testing doesn't diagnose allergies. It identifies environmental allergens so an individualized immunotherapy plan can be created for a dog already diagnosed with atopic dermatitis.
- 15Part 15 of 23Allergy Shots for Dogs: Can We Actually Change the Disease?Allergen-specific immunotherapy is the one allergy treatment designed to change the immune response itself rather than control today's itch — how it works, who it helps, and why it takes months.
- 16Part 16 of 23Elimination Diet Trials in Dogs: The Only Proven Way to Diagnose a Food AllergyFood allergy can't be diagnosed from blood, saliva, or hair tests. Here's how a properly performed elimination diet trial works, why strict feeding matters, and why the food challenge confirms the diagnosis.
- 17Part 17 of 23Why Flea Prevention Is One of the Most Important Allergy Treatments Your Dog Will Ever ReceiveMost owners of flea-allergic dogs never see a flea. Here's why one flea bite can cause weeks of itching, how flea allergy dermatitis is diagnosed, and why year-round prevention is allergy treatment.
- 18Part 18 of 23Why Does My Dog Still Have Fleas Even Though They're on Flea Prevention?Found a flea even though your dog is on flea prevention? Here's how modern flea medications actually work, why occasional fleas may still appear, and when it may signal a real problem.
Chapter 5 · Parts 19–20Managing Allergies at Home
Learn practical ways to support your dog's skin and reduce allergen exposure between veterinary visits.
- 19Part 19 of 23Bathing an Allergy Dog: One of the Most Overlooked Allergy TreatmentsHow often should you bathe a dog with allergies? Here's how bathing removes environmental allergens, why shampoo contact time matters, and how conditioners, wipes, and paw care fit in.
- 20Part 20 of 23Environmental Management for Allergy Dogs: How to Reduce Allergens at HomeYou can't remove every allergen, but you can lower your dog's allergen load. Washing bedding, vacuuming, HEPA filters, humidity control, paw wiping, and flea prevention all add up.
Chapter 6 · Parts 21–23Putting It All Together
Bring everything together into a long-term plan, understand when allergy symptoms become urgent, and review common questions.
- 21Part 21 of 23How I Build an Allergy Treatment Plan: A Veterinarian's Decision TreeEvery allergy dog is different. How veterinarians evaluate itching, rule out fleas and infections, decide on food trials, and build individualized treatment plans step by step.
- 22Part 22 of 23Is My Dog's Allergic Reaction an Emergency?Most allergies are uncomfortable—not life-threatening. Learn to recognize facial swelling, hives, difficulty breathing, collapse, and anaphylaxis, and know when your dog needs immediate veterinary care.
- 23Part 23 of 23Frequently Asked Questions About Dog AllergiesQuick, veterinarian-written answers to the allergy questions owners ask every week — itching, food allergies, Apoquel, Cytopoint, Benadryl, allergy testing, ear infections, paw licking, and bathing.