Educational information only, not medical advice. This article does not replace a veterinarian's examination, diagnosis or treatment plan. Have your pet assessed by a veterinarian before starting allergy treatment. The prescription medicines linked below require a valid prescription from a licensed Canadian veterinarian before dispensing and shipment. PetMedsToYourHome does not diagnose pets or issue prescriptions.
Allergies in dogs and cats can cause itching, licking, irritated skin and hair loss. Dogs may chew their paws or have recurring ear discomfort; cats may overgroom or develop scabs. These symptoms can also come from parasites, infection, pain or other conditions. A veterinary assessment is the starting point for choosing treatment.
This guide helps Canadian pet owners recognize possible allergy symptoms, understand veterinary treatment options and support their pets at home. It does not provide dosing instructions or recommend a particular medicine for an individual pet.
What are the symptoms of allergies in dogs and cats?
Dog allergy symptoms
Possible signs include persistent scratching, paw licking or chewing, face rubbing, red or irritated skin, hair loss and recurring ear discomfort. Some pets have digestive symptoms as well. These signs are reasons for an examination, not confirmation of an allergy.
Cat allergy symptoms
Cats may groom excessively, leaving a bare belly or patches of shortened fur. Scratching around the head and neck, scabs and irritated skin can also occur. Owners may notice missing fur without seeing the grooming that caused it. Do not assume overgrooming is simply a habit or stress.
When should an itchy pet see a veterinarian?
Book an assessment for persistent or recurring itching, ear discomfort, skin changes or overgrooming. Seek prompt advice for painful ears, open sores, discharge, spreading irritation, poor appetite or unusual lethargy.
Difficulty breathing, collapse or rapidly developing facial swelling requires urgent veterinary care. Open-mouth breathing in a cat is an emergency. Do not delay care to try an online remedy.
What causes allergies in dogs and cats?
Possible triggers include flea bites, environmental allergens such as pollen or dust mites, food ingredients and substances contacting the skin. Symptoms can be seasonal or year-round. More than one problem may occur together. Indoor pets still encounter potential allergens, and not seeing fleas does not rule out flea-related disease.
How do veterinarians investigate pet allergies?
Your veterinarian reviews your pet's history and examines the skin and ears. Tests for parasites and infections may be needed before allergy is considered the likely explanation. Bring photographs, a symptom timeline and a list of foods, treats, supplements, medicines and parasite preventives.
If food allergy is suspected, your veterinarian may recommend a supervised elimination diet followed by a food challenge. Treats, flavoured medicines and another pet's food can affect the trial. Never stop necessary medication without asking your veterinarian about an appropriate alternative.
Allergy testing may help select allergens for immunotherapy in suitable cases; it does not replace the initial clinical investigation.
What treatments are available for dogs with allergies?
A veterinary plan may combine medication for itch and inflammation, species-appropriate parasite prevention, treatment of secondary infections, topical skin care, dietary management or allergen-specific immunotherapy. Clinic-administered injections or a veterinary dermatologist referral may also be discussed. There is no single best treatment for every dog.
Apoquel for dogs: oclacitinib
Apoquel for dogs (oclacitinib) is a prescription option for allergic itch and atopic dermatitis in suitable dogs. Your veterinarian determines whether it is appropriate and prescribes the strength, quantity and directions.
Atopica for Dogs: cyclosporine
Atopica for Dogs (cyclosporine) is a prescription option for managing canine atopic dermatitis. Veterinary selection and monitoring are important. The dog capsules must not be substituted for a feline formulation.
Zenrelia for dogs: ilunocitinib
Zenrelia for dogs (ilunocitinib) is a prescription option for allergic itch and atopic dermatitis in suitable dogs. Discuss its safety requirements, including vaccination planning, with your veterinarian before treatment.
Product links are for information, not recommendations to start, combine or switch medication. This article does not contain complete safety information. Age, infections, other medicines, vaccination needs and medical history affect treatment selection. Follow the Canadian product label and your veterinarian's prescribed directions.
How are allergies treated in cats?
Cats need their own assessment and species-appropriate treatment. Depending on the diagnosis, a veterinarian may recommend parasite control, a prescribed diet, suitable topical care, a prescription anti-inflammatory or immunomodulating treatment, or immunotherapy.
The dog medicines linked above are not recommendations for cats. Never share medicines between pets, use a dog flea treatment on a cat or switch formulations without explicit veterinary instructions. Ask your veterinarian and pharmacist to confirm the exact feline product.
Non-medication tips for managing pet allergies at home
- Keep a symptom diary. Record affected areas, scratching, food, treats, walks and recent changes. Photograph skin changes for your veterinarian.
- Gently clean after outdoor activity. If tolerated, wipe paws and coat with a clean damp cloth and dry carefully. Avoid scrubbing sore skin.
- Clean resting areas regularly. Wash bedding according to its care instructions and vacuum to reduce dust and debris.
- Review fragrances and new products. Tell your veterinarian about new detergents, air fresheners, sprays or shampoos. Do not apply essential oils or unapproved home remedies to your pet.
- Use an individualized grooming plan. Ask which shampoo or skin-care product is suitable and how often to use it. More bathing is not always better. Do not force bathing on a distressed cat.
- Follow diet trials precisely. Check treats, chews and flavoured medicines with your veterinarian rather than repeatedly changing food on your own.
- Limit self-injury. Maintain appropriate nail care and ask your veterinarian about a protective collar or garment when scratching or licking damages the skin.
Home care can support comfort but does not replace treatment for parasites, infection or significant inflammation. Cleaning cannot remove every allergen.
Frequently asked questions about dog and cat allergies
Is paw licking always an allergy?
No. Pain, injury, parasites, infection and other conditions can cause paw licking. Persistent licking, redness or limping needs assessment.
Can an indoor cat have allergies?
Yes. Food-related triggers, household allergens and fleas may still be relevant. A veterinarian should investigate the cause rather than assume the symptoms are allergies.
Can a pet become allergic to food they have eaten for years?
Yes. A familiar diet does not rule out food allergy. Ask your veterinarian about a supervised elimination diet rather than trying repeated unplanned food changes.
Can I give my dog or cat a human antihistamine?
Do not start a human medicine without veterinary guidance. Suitability depends on your pet and the exact formulation; combination products can contain dangerous ingredients. Your veterinarian should decide whether an antihistamine has a role.
Do pet allergy medicines cure the allergy?
Many treatments manage symptoms or reduce reactions rather than permanently remove the underlying tendency. Follow-up care helps adjust the plan and check for complications.
Should I stop allergy medicine when my pet improves?
Speak to your veterinarian first. Some medicines require a planned course or gradual adjustment. Improvement alone does not establish that stopping is safe.
Can dog allergy medicines be used for cats?
Do not give a cat a dog medicine unless your veterinarian has specifically prescribed that exact product for the cat. Species, formulation and dose matter.
Are Apoquel, Zenrelia and Atopica sold by the bottle?
Our linked Apoquel and Zenrelia listings use per-tablet pricing; Atopica for Dogs uses per-capsule pricing. Select the prescribed strength and quantity. A container shown in a photograph does not mean a full bottle is included.
Ordering prescription allergy medication in Canada
The prescription medicines discussed here require a valid prescription from a licensed Canadian veterinarian before dispensing and shipment. Your pet must be assessed by a veterinarian. PetMedsToYourHome does not provide diagnoses or issue prescriptions.
Send your prescription to support@petmedstoyourhome.ca, have your veterinarian fax it directly to 519-954-3776, or ask our team to contact your clinic.
Prepare for your pet's allergy appointment
Bring your symptom diary and a complete list of products your pet receives. Ask which diagnosis is suspected, what improvement to expect, when to recheck and which changes require earlier contact. A clear veterinary plan makes home care easier to follow.
Medical disclaimer: This article is for general education and is not medical advice. It does not replace a veterinarian's examination, diagnosis or treatment. Owners must have their pets assessed by a veterinarian. All prescription medicines linked in this guide require a valid prescription from a licensed Canadian veterinarian. Never change prescribed treatment without consulting your veterinarian.
Veterinary resources
For further educational reading, see VCA Animal Hospitals' resources on allergies in dogs and allergies in cats. These do not replace individual veterinary care.
