How long does an allergic reaction last in dogs

How long does an allergic reaction last in dogs

Have you noticed that your dog had an allergic reaction or has been suffering from seasonal allergies for a long time? Do you know how to handle these allergic reactions in your dogs? It’s crucial to understand that dogs can have various allergies, including those to the environment, food, insect bites, or stings.

If you observe that your dog is suffering from any of these allergies, you should consult your veterinarian as soon as possible.

In this article, I will provide you all the basic information that you need to know about dog allergic reactions and how to deal with them; first of all, we discuss the types of allergies that occur in dogs:

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What are Common Dog Allergies?

An allergic pet’s immune system overreacts, producing antibodies to normally acceptable substances. An allergic or hypersensitive reaction is an overreaction. Allergies can develop into foods, fleas, seasonal environmental allergens like pollen or grass, or indoor allergens like dust mites or mold.

Types of Allergies in Dogs

The following are some common types of allergies in dogs:

1. Environmental Allergies

Grass, mold, pollen, and dust can cause an allergic reaction in your dog. Most allergens are inhaled, but some dogs develop contact allergies to shampoos, plants, or chemicals. Affected dogs lick, chew, and scratch all over their body.

 Light-colored dogs may develop reddish-brown staining from saliva or a red “rash” from skin irritation or secondary infection. Sneezing and runny eyes are more common in humans than in dogs.

Atopic Allergy is also another kind of environmental Allergy in dogs. Atopic dogs are allergic to multiple environmental factors, have severe symptoms, and are affected nearly around the year. These dogs require more aggressive management, and most require year-round allergy medication.

2. Food Allergies

In contrast to environmental allergies, 10–15% of allergic dogs have food allergies. Food allergies cause chronic soft stool, anal gland inflammation (pets scoot at home), ear infections, itching, and occasionally vomiting.

Acute, short-term, or infrequent stomach upset does not necessarily indicate a food allergy or intolerance. Food allergies cause antibodies to be formed against a protein or complex carbohydrate in the food. Because food allergies require antibody production, they typically occur after eating the same element of food like chicken meat for a long period of time.

3. Flea Allergy

Although flea allergies are medically environmental allergies, their clinical symptoms and treatment differ significantly from environmental allergies. Flea control is critical in a pet with allergies of any kind because anything that causes itching can aggravate already inflamed skin. The treatment of this type of Allergy is a difficult subject. If you think your dog might have a flea allergy, talk to your veterinarian.

Signs of Allergic Reaction in Dogs

The most common signs of an allergic reaction in dogs are:

  • rashes
  • Scratching
  • Licking
  • face rubbing
  • red skin
  • Fur loss
  • Skin and ear infections
  • Gastrointestinal symptoms

The intensity of these dog allergy symptoms varies depending on your dog’s allergies.

How long does an allergic reaction last in dogs
How long does an allergic reaction last in dogs

How long is an Allergy reaction Last in Dogs?

Depending on the allergen, allergic skin reactions in dogs can last anywhere from 2 to 3 weeks. When the immune function of the dog’s body reacts badly to an allergen, an allergic response develops. The immune system is the line of defense against foreign invaders and potentially infectious substances. Allergies and the reactions that result from them can last a lifetime.

The dog body tries to get rid of these allergic reactions by releasing more white blood cells, which attack foreign bodies and histamines into the bloodstream. Allergic reactions can take anywhere from 12 to 24 hours to manifest after coming into contact with an allergen.

It’s crucial to look 12 to 24 hours to figure out what’s causing these allergic skin reactions. Meanwhile, recovery and elimination of the allergy treatment may require a few hours to several months.

How to handle Allergic reactions in Dogs?

The following are some preventive measures you may take to prevent your dog’s severe allergic conditions:


If your dog is vomiting or has diarrhea, it’s crucial to get him to the vet as quickly as possible so he or she can receive the basic treatment. This may be a symptom of an early allergic response.


Itchy ears may generally wait until your next vet appointment comes because this is not a symptom of something serious condition in dogs.

But if your pet becomes more uncomfortable, has difficulty in walking, or has a tilted head to one side, take them to the veterinarian as soon as possible.


If your dog chews or licks his skin, particularly his feet, often or continuously, he may be suffering from allergies.

Irritants may cause the issue on the lawn or walks, but they could also be a sign of your dog’s food allergies. Even though the issue isn’t urgent, you’ll need to see a veterinarian in the following weeks to figure out how to treat it and what the underlying cause may be.


A dog with a swollen face is most likely suffering from an allergic reaction to an insect bite or sting. This may also indicate that your dog has inhaled an allergy, such as a lot of pollen.

A swelling face or nose indicates that your dog is in danger of going into anaphylactic shock. Anaphylaxis is frequent in dogs with a swollen face, but it does not always occur.

If your dog has any facial swelling, we suggest bringing him to see an emergency veterinarian so that it may be treated and avoided from worsening, which might lead to additional symptoms such as difficulty breathing if the swelling is severe enough.


Runny eyes are a sign of many upper respiratory illnesses in dogs, and this may also be an indication of the eye injury scratch or ulceration of the cornea.

 Take your dog to the doctor to rule out any possibilities by determining what the cause of watery eyes is.


If your pet is scratching severely, or you detect hives or redness on his skin, he may be allergic. All kinds of allergies are prone to these responses.

If these are the only signs you’re experiencing, you may wait a day or two before making an appointment with your veterinarian. However, if any other symptoms occur with them, make an appointment with your veterinarian right once.

Benadryl may assist with clinical symptoms and irritation in dogs, but it does not always effectively.

How long does an allergic reaction last in dogs

Frequently Asked Questions

1. Why Allergies are they common in Dogs?

Allergies are unfortunately prevalent in dogs of all breeds and cultures. Most of the allergies develop in dogs when they are six months old, and it becomes more susceptible in canines when they are one or two years old. This is because the dog’s body takes time to become “hypersensitive” to the element to which the pet is allergic.

2. Why do veterinary doctors prescribe antibiotics if your dog is suffering from Allergy?

Whatever kind of Allergy your dog is facing, scratching traumatizes the skin, weakening the protective barrier and allowing “outside” microorganisms to enter deeply into the layers of skin. Allergies and pyoderma skin infections may produce a vicious cycle.

Treatments for secondary infections such as ear infections include oral antibiotics, medicated shampoos, and ear drops. Any effective allergy treatment strategy is to provide antibiotics with an aim to prevent secondary infections, but they are treated individually when they arise in dogs.

3. Can allergies develop in dogs over time?

As stated in the definition of an allergy, it is not uncommon for an older dog to develop it. When your dog’s immune system is repeatedly bombarded with the same stimulant, it starts producing antibodies to protect itself from a long-term illness.

These antibodies accumulate over time and cause allergies in older dogs. Allergies caused by external stimuli usually appear in adult dogs, but they can appear as early as six months old. In rare cases, allergies can develop later in life, and allergies in adult dogs are not uncommon.

4. How are Allergies introduced into the dog’s body? 

Allergens may be inhaled, eaten, or touched directly. Inhaled allergens are equally common in dogs as in people. Your dog may be allergic to other animal hairs. Call your vet if your dog is licking his paws or has foot discomfort. An allergy is any substance that enters your dog’s bloodstream accidentally.

Embedded allergens cause significant skin symptoms, including hives, rashes, Inflammation. Contact allergies are rare, mostly rare in dogs.

5. How do I know my dog is suffering from a skin allergy?

While you may be tempted to treat your dog’s skin allergy on your own, you must take expert medical guidance from your dog’s veterinarian. A vet can diagnose your dog’s skin allergy based on his symptoms and medical history.

 Your dog may have mild allergies or skin problems that may not need long-term care. It is your obligation to observe indications of discomfort and abnormal behavior in your dog and seek assistance for them. For long-term health issues, always seek the advice of a qualified medical expert before trying new medicines or making changes to your dog’s diet.

6. Is Heat rash is an allergy in dogs?

Heat rash is undoubtedly an allergic reaction. Heat is an external stimulant that causes your dog’s immune system to respond. As a result, heat rash, a type of allergic dermatitis, appears in dogs.


 Allergies in dogs are common, and if you know what to look for, they can be easy to spot. Learn about the most common types of allergy problems that dogs face. If your dog expresses any of these allergic symptoms, make every effort to account for any changes in its surroundings. Keep an eye on your pet’s health and skin condition, and if any signs or symptoms of Allergy appear, contact your veterinarian right once.


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