As guardians of dogs with allergies, it’s natural to want to relieve your pup’s discomfort in the summer months by giving them anti-allergy medication like Piriton. 

However, you cannot do so except strictly under the guidance of a vet, for reasons explained in this article. 

In this article, our Chief Veterinarian and Omni Co-Founder, Dr. Guy MRCVS, explores the use of Piriton for dogs.

Can Dogs Have Piriton?

Yes, but strictly only under the advice of a vet. 


Do not give your dog Piriton without having first consulted a veterinarian. 


Piriton can be effective for managing allergies in dogs, but it is an “off-licence” medication for dogs, meaning it is only approved for human use, and not licensed for use in dogs. 

 

Recent legislation changes make it illegal for vets to use and unlicensed drug if there is a licensed one available.


Vets must follow prescribing guidance (known as 'The Cascade') issued by the government agency 'the Veterinary Medicines Directorate'.  This provides a hierarchy of how vets should select the medication they want to prescribe - starting within licensed medication for use in that species, to medication licensed in a different animal species, to medications which isn't licensed for use in animals.

Why Piriton Is Not the Best First Option

Piriton has potential side effects that should be taken seriously, as giving off-licence medication to dogs can often go the wrong way, especially if not under veterinary supervision. Some of these side effects are: 

  • Sedation or lethargy
  • Gastrointestinal upset
  • Agitation or restlessness
  • Seizures

As well as this, there are a number of alternatives to Piriton that are licenced for veterinary use in the UK. 

Alternatives to Piriton for Dogs 

Some alternatives to Piriton that may be prescribed by vets include: 


  • (not licensed)
  • - (not licensed)
  • Apoquel
  • Steroids
  • Ciclosporin

Again, however, these drugs are  only available with a prescription from a veterinarian. It is important when medicating your dog that you only do so under expert advice and that you seek out expert advice at the earliest opportunity whenever a problem arises. 


This is why our team at Omni offer free consultations to our customers*. 

Risks of Giving Piriton to Dogs

Giving Piriton without veterinary supervision can lead to serious health risks for your dog.

  • Diarrhoea: Some dogs may experience an upset stomach with Piriton. 
  • Drowsiness: Like humans, dogs can become drowsy on antihistamines. Ensure you follow the correct dosage as prescribed by your vet or as stated on the package depending on the weight of your dog. 
  • Vomiting: Dogs may vomit initially; if this doesn’t subside, stop the medication and contact your vet.
  • Dry Mouth: If your dog seems to have a dry mouth, provide plenty of fresh water throughout the day.
  • Behavioural Changes: Watch for any unusual behaviour. This should pass, but if it continues, seek veterinary advice.
  • Seizures
  • Piriton is metabolised by the liver, so could be dangerous to use if there are any existing liver problems 

Note that Piriton is an off-licence medication and should only ever be used under the strict instructions of a vet. 

Is Piriton Ever Safe for Dogs?

While Piriton may have a place in certain treatment plans, it is an "off-licence" medication for dogs, meaning it has not been approved specifically for canine use. A vet can only prescribe or recommend it when there is a justified medical reason, and the dosage must be precise.

When Vets Might Prescribe Piriton:

  • Special conditions: In rare cases, a vet might recommend Piriton if other pain relief options are not suitable, for example, if a dog has an intolerance to many other medications.
  • Precise dosing: Only a vet can determine the correct dosage, which is often much lower than what humans take. Never attempt to give your dog Piriton without professional guidance.

How to Safely Manage Your Dog's Allergies

If you suspect your dog is suffering from allergies (for instance, with rashes, itchy skin, irritated eyes, or waxy ears), always consult a vet first. They will be able to assess the situation and recommend the most appropriate treatment plan. 

You may also want to consider the following: 

  • Changing your dog’s diet to a hypoallergenic, novel protein diet like Omni Sensitivity. This avoids common allergens like various animal proteins as well as grains, gluten and soya, allowing you to eliminate potential allergens whilst still providing a nutritionally complete diet for your dog. 
  • Using an allergy-friendly Omega-3 and 6 supplement. These healthy fatty acids are essential for maintaining a strong skin barrier against the outside world and preventing the worst of allergies. Omni’s Irritated Skin supplement is created with this in mind, with Omega-3 and 6 derived from marine algae. 

Speak with a Vet If…

  • You are unsure about your dog’s symptoms or the appropriate course of action.
  • Your dog has pre-existing conditions like liver or kidney disease, which could increase the risk of complications.
  • You need advice on allergy management

Book a free consultation with Omni’s veterinary team to get expert advice on your dog’s health strategies. Never medicate your dog with human medications without professional guidance.

Thoughts from Dr Guy MRCVS


As dog lovers and guardians, it’s natural to worry about our furry friends, especially when they display abnormal symptoms that can’t be easily explained. That’s why, when I founded Omni, I knew that I wanted to keep vet consultation free and accessible at the heart of the business. 


If you’re understandably worried about your dog, but you don’t think you need to take them to the vets urgently, I highly recommend getting some friendly, professional advice from one of our team. 


Book your appointment here


Disclaimer: Our Video Vet Consultation service is limited because we are unable to perform a full physical examination of your pet. Our vets have no responsibility for the examination or other medical services provided during the Consultation.


Please note that our Video Vet Consultations do not replace traditional veterinary care, but can provide additional support.  Based on the information you have provided and the symptoms you have described, the Vet will give you advice and an ongoing plan. Without a physical examination, we cannot provide a definitive diagnosis. If you are worried that your dog's condition is worsening, or you need additional support, please schedule another consultation, or see your registered vet.


* Omni’s vet team cannot issue prescriptions, but are a good first port-of-call for anybody uncertain about whether a problem warrants veterinary attention or not, as well as for advice around diet, lifestyle, and behavioural problems.

FAQs

But aren’t dog’s carnivores?

Dogs are in fact nutritional omnivores as demonstrated by a robust scientific study published in the reputable journal Nature (1,2) in which it was shown that they have 30 copies of the AMY2B gene responsible for digesting plant-based foods.

They have also evolved relatively long intestines (21) (almost as long as humans) and relatively flat surfaces on their molars (31, 22) which they use for digesting and chewing a whole range of foods.

The common misconception that dogs are carnivores probably arises from the fact that they are classified in the order Carnivora but so are plenty of other species like bears, skunks, racoons who are omnivores and even the giant panda who thrives on a plant-based diet (20).

Is plant protein digestible to dogs?

Absolutely yes, studies which have looked at how much protein dogs can absorb from plant-based and fungi-based foods like soya and yeast demonstrated over 75% digestibility which is on par with meat-based foods (23, 24, 34, 35 & 25).

Both these protein sources also contain all 10 essential amino acids (36, 37) that dogs need to thrive.

Isn't there too much fibre in plant-based food?

The average amount of fibre in a commercial dog food diet is between 2-4%. omni’s plant-powered recipe has a fibre content of 3% which is on par with meat- based diets.

In our survey with over 200 dog owners, 100% reported that their dog’s stool consistency was either ‘normal’ or ‘perfect’ and there were no reports of any digestive upsets (data on file).

Can I mix omni with other meat-based diets?

We are proud that our recipes are nutritionally complete and so include everything your dog needs to thrive. This means omni can be fed as a sole ration. We also fully support a 'flexitarian approach' like meat free lunches or using omni as a mixer.

Every little helps to bring some of the health and environmental benefits of plant-power to meal times. Mixing omni with meat/fish will help to add variety into your dog’s diet whilst adding in healthy ingredients with a relatively low carbon footprint.

Can plant-based food provide the essential fatty acids dogs need?

All the essential fats and oils that dogs need, including omegas 3 and 6 are found in a variety of both meat and plant-based foods (31, 28).

omni’s recipe is rich in plant-based sources of these nutrients so your dog will get all the essentials they need.

I hear a lot about feeding raw meat, isn’t that better?

Feeding raw meat to dogs has become a very popular trend in recent years, but most vets will warn against this practise. This is because the cooking process is vital to help kill off dangerous bacteria like E coli, Salmonella and Campylobacter (9) that have necessitated several food recalls from the market and caused serious illness and even death in both dogs and their owners (40, 41, & 42).

There are also several worms and parasites that are only killed off when raw meat is cooked. Dogs are dogs, not wolves and thanks to their domestication over thousands of years, thankfully don’t need to hunt to get their grub nor do they need to eat raw meat, it's just not worth the risk.

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