Allergies are one of the most common health problems in Shih Tzus, causing endless itching, skin infections, ear problems, and significant discomfort. As a breeder at Delasa Forever Shih Tzu with over 10 years of experience serving families across the USA and Canada, I've helped hundreds of owners identify and manage their Shih Tzu's allergies. This comprehensive guide will help you recognize allergy symptoms, identify triggers, and develop an effective management plan.
⚠️ Critical Fact: Shih Tzus are genetically predisposed to allergies. Up to 30% of Shih Tzus will develop some form of allergy during their lifetime. The good news is that most allergies can be successfully managed with the right approach.
Types of Allergies in Shih Tzus
Shih Tzus can suffer from three main types of allergies, often overlapping:
- Food allergies: Reaction to specific ingredients in their diet
- Environmental allergies (Atopic Dermatitis): Reaction to pollen, dust mites, mold, or grass
- Flea allergy dermatitis: Severe reaction to flea saliva (even one flea bite!)
- Contact allergies: Reaction to shampoos, fabrics, or cleaning products
Common Allergy Symptoms in Shih Tzus
If your Shih Tzu has allergies, you'll likely notice one or more of these signs:
- 🖐️ Excessive scratching, licking, or chewing – especially paws, face, ears, armpits, and belly
- 🦶 Red, inflamed skin – often between toes, on belly, or around eyes/mouth
- 👂 Recurrent ear infections – brown or black discharge, foul odor, head shaking
- 😤 Chronic sneezing or reverse sneezing – especially with environmental allergies
- 🐾 Hair loss or thinning coat – from constant scratching or licking
- 💩 Digestive issues – vomiting, diarrhea, gas (more common with food allergies)
- 🟤 Red/brown staining around eyes and paws – from tears and saliva (yeast overgrowth)
Food Allergies in Shih Tzus
Food allergies account for about 10-15% of allergies in Shih Tzus. They can develop at any age, even to foods they've eaten for years.
Most Common Food Allergens for Shih Tzus
- Chicken – the #1 food allergen in Shih Tzus
- Beef – second most common
- Dairy – many Shih Tzus are lactose intolerant
- Wheat and corn – common fillers in low-quality foods
- Soy and eggs – less common but possible
How to Diagnose Food Allergies: The Elimination Diet
The gold standard for diagnosing food allergies is an 8-12 week elimination diet:
- Switch to a novel protein and carbohydrate your Shih Tzu has never eaten (e.g., venison and potato, rabbit and pea, hydrolyzed protein prescription diet)
- Feed nothing else – no treats, table scraps, flavored medications, or chews
- Watch for symptom improvement (typically takes 6-8 weeks)
- If symptoms resolve, re-challenge by adding back old ingredients one at a time
- Identify triggers and avoid them permanently
Work with your veterinarian – they can prescribe hydrolyzed protein diets that make elimination diets easier.
Environmental Allergies in Shih Tzus
Environmental allergies (atopic dermatitis) are the most common type, affecting up to 15% of Shih Tzus. Unlike food allergies (constant year-round), environmental allergies are often seasonal, though indoor allergens can cause year-round symptoms.
Common Environmental Allergens for Shih Tzus
- Pollen from trees, grasses, and weeds (seasonal)
- Dust mites – year-round, worse in bedrooms/carpets
- Mold spores – indoor and outdoor
- Grass – direct contact reaction (often seen on paws and belly)
- Flea saliva – flea allergy dermatitis (severe reaction to even one flea bite)
Treatment Options for Environmental Allergies
- Allergy testing and immunotherapy: Skin or blood tests identify specific triggers, then custom allergy shots or oral drops desensitize your dog. This is the closest thing to a "cure."
- Apoquel (oral medication): Rapidly stops itching (within 4 hours), safe for long-term use in most dogs. Requires prescription.
- Cytopoint (injection): Monoclonal antibody injection lasts 4-8 weeks, very safe with minimal side effects.
- Antihistamines: Benadryl, Zyrtec, or Claritin – work for mild cases but often ineffective for moderate/severe allergies. Always consult vet for dosing.
- Medicated shampoos: Antifungal and antibacterial shampoos (Duoxo, MiconaHex+Triz) soothe skin and treat secondary infections.
Flea Allergy Dermatitis in Shih Tzus
Shih Tzus with flea allergies react severely to even one flea bite. Year-round prevention is essential. Use veterinary-recommended preventatives: oral (NexGard, Simparica, Bravecto) or topical (Revolution, Frontline Gold). Never use cheap grocery store brands – they're often ineffective and can be toxic.
Secondary Skin and Ear Infections
Constant scratching and licking from allergies often lead to secondary bacterial and yeast infections, which make itching even worse. Look for:
- Skin: Red bumps, pustules, crusting, "elephant skin" thickening, foul odor
- Ears: Brown/black discharge, head shaking, ear odor, redness
These require veterinary treatment with antibiotics or antifungals. Don't ignore them – they won't resolve on their own.
Dietary Support for Allergic Shih Tzus
Even if food isn't the primary allergen, diet plays a crucial role in skin health:
- Omega-3 fatty acids (fish oil): Reduces inflammation, improves skin barrier function. Look for high-quality salmon or krill oil.
- Probiotics: Support gut health and immune function
- Limited ingredient diets: Fewer ingredients mean fewer potential triggers
- Raw or fresh food: Some owners report improvement, but not scientifically proven. Discuss with your vet.
Home Environment Management
Reduce environmental triggers at home:
- Use HEPA air purifiers in rooms where your Shih Tzu spends time
- Vacuum weekly with HEPA-filter vacuum, wash bedding weekly in hot water
- Wipe paws and belly after walks (remove pollen and grass allergens)
- Bathe weekly with hypoallergenic or medicated shampoo during allergy season
- Keep humidity between 30-50% (dust mites thrive in higher humidity)
- Remove carpet if possible (carpet traps allergens)
When to See a Veterinary Dermatologist
If your regular vet isn't making progress, ask for a referral to a board-certified veterinary dermatologist. They have advanced training in allergy diagnosis and treatment, including intradermal skin testing (more accurate than blood tests) and immunotherapy desensitization.
Find Your Healthy Shih Tzu Puppy
At Delasa Forever Shih Tzu, we prioritize health testing and only breed dogs without chronic allergy issues. View our available Shih Tzu puppies for sale or contact Carolina to learn about our health guarantee and allergy prevention in our lines.
