Skin Allergies

Allergic skin disease is one of the most common, and often most frustrating medical conditions affecting dogs. Allergies may begin in puppies just a few months old, or they may develop later in life. There are several major categories of skin allergies. Each type tends to affect different parts of the body and may require different management strategies.

 

The Main Types of Skin Allergies

1. Atopy (Environmental / Airborne Allergies)

This is the most common type of allergy seen in dogs.

Atopy occurs when pets react to inhaled environmental allergens such as:

· Pollens (grasses, plants)

· Dust

· Dust mites

· Mould spores

Although allergens are inhaled, the reaction appears in the skin.

Commonly affected areas:

· Ears

· Paws (licking and chewing)

· Face

· Underarms

· Groin

2. Flea Allergy

Fleas are a common trigger of allergic dermatitis.

Most commonly affected area:

· Lower back, especially near the base of the tail

Some pets only itch when heavily infested. Others are extremely sensitive — a single flea bite can trigger itching for days or weeks.

Importantly:

Many allergic pets never have visible fleas — only the allergic reaction.

If your pet is scratching around the tail base (especially in warmer months), flea allergy must always be considered — even if you have never seen a flea.

3. Contact Allergy

Contact allergies occur when the skin reacts to something it physically touches.

Common triggers include:

· Grasses

· Wandering dew

· Plants

· Certain surfaces

Commonly affected areas:

· Belly

· Armpits

· Paws

· Areas with less hair coverage

These pets often worsen after lying or running through grass.

4. Food Allergy

True food allergies are less common than environmental or flea allergies (estimated at less than 7% of allergic skin cases).

Any protein source can potentially trigger a reaction.

The only reliable way to diagnose a food allergy is through a strict 6–8 week hypoallergenic diet trial, where:

· No treats

· No flavoured medications

· No table scraps

· No other food

Prescription diets commonly used for proper food trials include:

· Royal Canin Anallergenic

· Prime100 Crocodile & Tapioca

If the skin improves during the trial and flares again when the original diet is reintroduced, a food allergy is confirmed.

Signs of Skin Allergies

Early signs may include:

· Mild redness of the skin

· Ear shaking

· Paw licking

· Rubbing on carpet or furniture

· Mild scratching

As allergies progress:

· Skin becomes more inflamed

· Persistent scratching occurs

· Hair loss develops

· Possible secondary ear infections

· Skin thickening or darkening may appear

If scratching continues unchecked, secondary bacterial and yeast infections commonly develop. At this stage, both the allergy and infection require treatment.

Early intervention prevents more severe and prolonged flare-ups.

Treatment Options

Treatment depends on the severity of the allergy, the underlying cause, and the individual patient. Many pets require a combination approach.

Steroids (Prednisolone)

Steroids are highly effective at rapidly controlling itch and inflammation.

Key points:

· Very effective

· Low cost

· Fast acting

When used at low doses and short courses, side effects in pets are usually mild. However, long-term high-dose use increases the risk of side effects, so we aim to alternative therapies where possible.

 

Antihistamines

Antihistamines have minimal side effects but are unfortunately far less effective in pets than in humans.

They may:

· Provide mild relief

· Low cost

Success rates are low (reported <2% in dogs), but they are sometimes useful as part of a broader plan.

 

Antibiotics & Antifungals

Used when secondary infections are present.

These may be:

· Topical treatments

· Oral medications

Early treatment of infections reduces the need for prolonged medication courses.

 

Apoquel (Oclacitinib)

A non-steroid immune-modulating tablet used in dogs over 12 months of age.

· Rapid itch relief

· Effective in approximately 70–80% of cases

· Fewer long-term side effects than steroids

· Initially given twice daily for 2 weeks, then once daily maintenance

A valuable option for dogs requiring long-term control.

 

Zenrelia (Ilunocitinib)

A newer medication in the same family as Apoquel.

· Once daily dosing from the start

· Similar effectiveness (70–80%)

· Non-steroid

· For dogs over 12 months of age

An alternative option for ongoing allergy management.

 

Cytopoint (Lokivetmab)

A monthly (sometimes longer) injection for dogs.

· Works like an antibody targeting itch pathways

· Effective in 70–80% of cases

· Excellent option for dogs that cannot tolerate steroids

Some dogs respond for 4 weeks; others may get 6–8 weeks of relief.

 

Atopica (Cyclosporine)

A non-steroid oral medication (used less commonly given newer available options).

· Useful in severe or steroid-dependent cases

· Can reduce or eliminate steroid use

· Some dogs experience vomiting or diarrhoea initially

A good option when other therapies are ineffective.

 

Paw Conditioner Spray

A diluted 50/50 spray used daily initially, then 2–3 times weekly long-term.

· Low side effect profile

· May reduce severity of allergies

· Can decrease reliance on other medications

Helpful as an adjunct therapy for chronic skin allergy cases.

 

Omega-3 Fatty Acids (Skin Barrier Support)

Omega-3 supplements help strengthen the skin barrier and reduce inflammation in allergic pets.

They are not itch relievers, but when used long term can:

· Improve skin and coat quality

· Reduce flare-up severity

· Help lower reliance on medications

Omega-3s can be given as fish oil capsules, liquid formulations, commercial products or through veterinary skin-support diets.

 

Desensitisation (Allergy Immunotherapy)

Performed by a veterinary dermatologist (skin and ear specialist)

This involves:

1. Skin and/or blood testing to identify specific environmental allergens

2. Creating a personalised allergy serum

3. Gradual injection therapy to desensitise the immune system

Success rates vary between patients (reported ~60%)

Although more expensive initially, immunotherapy is an excellent long-term solution for severe environmental allergies and can significantly reduce or eliminate the need for medication.

A Long-Term Approach

Allergies are usually a lifelong condition. The goal is not to “cure” them, but to:

· Control itch

· Prevent infections

· Minimise flare-ups

· Maintain excellent quality of life

With early diagnosis and an appropriate management plan, most allergic pets can live very comfortable, happy lives.