Read This Before Giving Your Dog Allegra For Allergies!

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Does your dog have bad allergies? Are they itchy with runny eyes and/or sneezing?

You want to know if Allegra can help so let’s get straight to the point:

Can I Give My Dog Allegra?

Vets do prescribe Allegra, but one version is off limits to pets. Allegra-D contains pseudoephedrine which can easily harm your dog.

The regular over-the-counter formula is not toxic at low doses.

Dogs Can Take Allegra (with vet approval)

Never use a leftover supply!

Though this 2nd generation antihistamine reduces histamine effects in animals, it’s important to avoid putting your dog at risk.

A Vet’s View Regarding Allegra

We asked for Sara Redding Ochoa’s (DVM) input and here is what she told us…

“Allegra can help dogs with allergies. It can be given once a day and often has the same effect as Benadryl (which really needs to be given 3 times daily).

Allegra is typically for mild allergies, whereas more severe allergies may require Apoquel.”

Results of an Excellent Study

Fexofenadine was administered to 15 dogs with atopic dermatitis. The Slovenian researchers gave an amount on average that was 7.5 times the human recommended dose (or approximately 36mg per pound of each dog’s body weight).

Observed side effects were minimal and included “eye and nasal discharge, loss of appetite
and skin rash.”

Overall the treatment was successful.

In fact, it was concluded that Fexofenadine was, “effective in reducing the severity of pruritus and the presence of skin lesions in dogs with atopic dermatitis.”

This study, entitled The Efficacy of Antihistamine Fexofenadine Versus Methylprednisolone in the Treatment of Atopic Dermatitis In Dogs, is worth reading for additional information.

Confirm Correct Treatment

This drug (Fexofenadine or Fexofenadina) must be given for the right reasons and at the prescribed dose.

Allegra can block the mechanisms that trigger your dog’s allergies, but go about it responsibly.

Get a proper diagnosis!

What’s actually causing the underlying allergy should be determined. Allegra may not be the best treatment for your dog’s condition.

How to Address Allergies

Stubborn allergies often originate from the environment, food as well as various other external factors. Yet, it can be very difficult to pin down the exact problem.

Again, a thorough check-up will identify not only what the dog is allergic to but also optimal treatment options.

Only after an assessment of the situation would a good veterinarian prescribe an antihistamine (such as Allegra, Benadryl or even Claritin).

Causes And Symptoms

Typical allergen triggers include:

  • Dander
  • Mold spores
  • Dust
  • Feathers
  • Cigarette smoke
  • Food ingredients
  • Harmful prescription drugs

Allergy-prone dogs can be affected in many different ways. Reactions can surface as red/itchy skin, watery eyes, increased scratching, sneezing, vomiting, diarrhea and constant licking.

2 Serious Side Effects

Although Allegra tends to have relatively few downsides compared to other antihistamines, coughing and/or vomiting could occur (thankfully rare) and would be concerning.

Stop use immediately and contact your vet if your dog experiences those two symptoms.


FYI: Mild stomachache and dizziness are common side effects besides those documented in the above-mentioned study.


Make Some Key Changes

Do an evaluation of your home before quickly reaching for Allegra.

If need be, clean the house. Sweep and mop the floors as well as vacuum the rugs and furniture.

Pet dander can turn up everywhere! Eliminating it, as best you can, may actually cure your dog’s allergies (something Allegra cannot do).

Effective Home Remedies

Does your dog suffer from skin irritations that manifest in the form of itching and scratching?

You can mix baking soda in water and pour it on the itchy parts.

Another approach is to bathe your buddy in oatmeal that’s been dissolved in cool water for about ten minutes. It often works!

The Bottom Line

Allegra also works on dogs, but the D version is super dangerous!

Really the ultimate source(s) ie. allergens should be pinpointed and eliminated to truly handle pesky allergies. Quite often a vet’s assistance is needed.

Going it alone, with any type of OTC Allegra, is a bit risky for the average dog.

Get your furry friend checked out! Otherwise, stick to safer remedies.

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