Tag Archives: atopy

Keeping your pets safe this Summer – Itchy skin

 

 

Is your dog constantly itching, rubbing, or biting at their skin? Does it feel like you have tried everything?

Your pet may have atopic dermatitis, or atopy, an inflammatory, chronic skin disease. Like hay fever in humans, dogs can be allergic to pollen, grasses, dust mites, and other environmental allergens that cause this unpleasant reaction.

Dogs suffering from atopy can be itchy in one area of their body or all over. Often the itchy rash affects the armpits, groin, face, feet and ears. Dogs normally begin to show signs between 3 months and 6 years of age. Often these signs progressively worsen over time due to exposure to new allergens with age. Initially the itchiness may appear seasonal with flare ups occurring more in spring or summer, however these periods can become longer and seem year-round.

Atopy has been diagnosed in dogs for years and it has been difficult to manage. Veterinarians turned to steroids, such as prednisolone, to treat atopy, although many did not like prescribing a medication that can have serious side effects if used long-term. Luckily there is a new breakthrough steroid-free drug called Apoquel for treatment of allergic dermatitis.

It has increasingly become a first choice treatment option because it is safer than steroids and fast acting. Clinical trials found dogs treated with Apoquel had a marked success rate versus those who were given placebos. It is a tablet given twice a day for two weeks, then once a day for maintenance. It may be the alternative long-term approach we have been looking for.

Please remember that a diagnosis of atopy is one of “rule-outs” from other causes of itchy skin including fleas, mites and skin infections that are treated differently. Call us to book a time for us to confirm the diagnosis and see if Apoquel is right for your dog.

Itchy Dogs

Many itchy dogs have the doggy equivalent of hayfever, which is called atopy.  A lot of dogs are allergic to flea saliva but only a few are allergic to food.

Common causes, or allergens, include pollen, grasses and dust mites.

Atopic dogs also have a poor skin barrier that allows the allergens to penetrate the skin and provoke the allergic reaction.

How does atopy affect my dog?

Dogs with atopy constantly scratch, bite, rub or chew themselves.  Itchy dogs don’t always scratch. They may rub their faces, flap their ears, or lick and chew their feet.

Some dogs scratch continuously but don’t damage their skin, whilst others quickly rub themselves raw. Recurrent ear infections are common.

Some dogs show signs of atopy as young as 3 months old, but usually it first occurs between 1 and 3 years of age. Initially most dogs will only be itchy during certain seasons, usually spring and early summer. As your dog ages, these itchy periods become longer.

As atopic dogs age, they become allergic to more things. Each dog has an allergenic load he can tolerate before he starts to itch. Exposure to one extra pollen or flea bite pushes him over the threshold into scratching or rubbing.

Diagnosis depends on the information you supply and examination of the skin. Tests such as skin scrapings and cytology rule out mites and secondary infections.

We may also rule out flea and food allergy by eliminating fleas and starting a dietary trial.

Skin testing by a specialist dermatologist will identify the allergens.

How to we treat atopy?

It is rare to cure atopy. We control it with a combination of strategies:

Improving the skin barrier:

  • Use shampoos without sulphates
  • Add essential fatty acids like Nutricoat, Megaderm, and fish oil to the diet
  • Apply sphingosines found in Nutriderm shampoo and conditioner,
  • Minimise bathing as much as possible

Avoiding allergens:

  • Vacuum carpeted areas frequently and minimise bedding to reduce dust mites
  • Keep your pet inside on windy days or when mowing

Treatments:

  • Cortisone offers immediate relief but can have serious side-effects if used long term
  • Atopica has fewer side-effects than cortisone and is often very effective but can be expensive in large dogs in the initial stages
  • Hyposensitization with repeated small injections of low doses of a combination of allergens chosen by a dermatologist on the basis of skin tests. These suppress the allergic reaction successfully in approximately 70% of atopic pets. Relief is not immediate and they usually require injections at least monthly for the rest of their lives. However in responsive pets hyposensitisation minimises the use of other medication.
  • Antihistamines such as Claratyne, Fexotabs, Claramax or Zyrtec are helpful in some cases but are rarely as effective as in humans.
  • Shampoos containing aloe vera and oatmeal may ease itchy skin

Skin allergies can be challenging to control and require a systematic approach to diagnose and treatment.  With commitment and care, most pets can enjoy a comfortable life despite ongoing exposure to environmental allergens.