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Can Dogs Lymph Nodes Swell From Allergies?



Reviewed By: Dr. Joel Robertson

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While it’s common knowledge that allergies can cause a variety of symptoms in dogs, few are aware that they can also lead to swollen lymph nodes, a condition known as lymphadenopathy.

Although not all allergic reactions will trigger this response, it’s crucial for pet owners to understand when and why this might occur.

Key Takeaway

  • Dogs’ lymph nodes can swell from severe allergies as the immune system responds to the allergen, though it is more common in severe cases and not all allergies will trigger this reaction.
  • Symptoms of lymph node swelling in dogs due to allergies include itchy skin, hives, coughing, sneezing, and labored breathing.
  • Swollen lymph nodes in dogs can indicate a variety of underlying issues beyond allergies. These can include infections, tumors, or other diseases.

Can Dogs Lymph Nodes Swell From Allergies?

Can Dogs Lymph Nodes Swell From Allergies

Yes, dogs’ lymph nodes as a part of the immune system can indeed swell from allergies while in the process of fighting off allergens.

Allergies occur when the body’s immune system has an adverse reaction to a foreign substance or antigen that it comes into contact with, such as pollen, dust mites, fleas, certain foods, and more.

When this occurs, the body releases histamines into the skin and surrounding tissue in order to fight off the allergen.

This process causes inflammation of the skin and surrounding tissues which leads to swelling of the lymph nodes.

See also: Can Dogs Live Without Lymph Nodes?

Symptoms of Lymph Node Swelling in Dogs Due To Allergies?

  • Swelling or lumps: You might notice unusual lumps under your dog’s skin, particularly around the neck, behind the knees, or near the armpits. These are areas where lymph nodes are commonly found.
  • Excessive scratching: If your dog is allergic to something, it might scratch excessively at the area. This can cause inflammation and swelling of the lymph nodes.
  • Redness and irritation: The skin around the swollen lymph nodes may appear red and irritated due to the allergic reaction.
  • Changes in appetite or behavior: Dogs with swollen lymph nodes may also show changes in their eating habits or behavior. They might be less active than usual or show signs of discomfort.
  • Difficulty swallowing or breathing: In severe cases, if the lymph nodes in the neck are swollen, it can make it hard for the dog to swallow or breathe.
  • Fever: A fever can often accompany swollen lymph nodes, as the body tries to fight off whatever is causing the allergic reaction.

See also: Can Dog Lymph Nodes Be Removed?

Are Swollen Lymph Nodes in Dogs Always a Sign of Allergies?

No. Swollen lymph nodes in dogs are not always a sign of allergies. While severe allergies can indeed cause lymph node swelling in dogs, it’s not the only cause.

Lymph nodes are part of the immune system and can become inflamed in response to a variety of conditions including viral, bacterial, or fungal infections, parasites, autoimmune diseases, leukemia, and cancer.

Often, swollen lymph nodes are an indicator of an ongoing infection or disease process in a dog’s body.

However, in some cases, allergies may result in enlarged lymph nodes. This is particularly true for dogs with severe allergies.

Allergies in dogs might also be accompanied by other symptoms such as itchy skin, red eyes, sneezing, nausea, lack of appetite, vomiting, and difficulty swallowing, eating, or breathing. It’s worth noting that not all allergies will trigger lymphadenopathy though.

See also: 9 Causes Of Swollen Lymph Nodes In Dogs

How To Differentiate Between Lymph Node Swelling Caused By Allergies and Other Health Issues in Dogs?

Lymph node swelling caused by allergies is typically not accompanied by any other signs of illness or discomfort.

However, if your dog has an enlarged lymph node that is accompanied by symptoms like fever, lethargy, appetite loss, coughing, vomiting, or diarrhea then it could be a sign of health issues such as infection or cancer.

Allergic reactions are usually localized and present as irritation, redness, inflammation, or bumps on the skin.

It is important to consult with your veterinarian if you notice any swollen lymph nodes in order to properly diagnose the issue and determine the best course of treatment.

See also: How Big Are Dog Lymph Nodes?

What Types of Allergies Are More Likely To Lead To Swollen Lymph Nodes in Dogs?

  1. Severe Allergies: Dogs with severe allergies may experience swollen lymph nodes as a result of the allergic reaction. Other symptoms often accompany these allergies such as excessive scratching, redness, and irritation of the skin.
  2. Seasonal and Environmental Allergies: Seasonal and environmental allergens can trigger the immune system, which in turn triggers a response from the lymphatic system. This response can cause lymph nodes to swell.
  3. Food Allergies: Food allergies can also cause swollen lymph nodes in dogs. The release of histamine, a chemical found in high levels during a food allergy, can lead to swelling of the lymph nodes.

How To Treat and Manage Swollen Lymph Nodes in Dogs Caused By Allergies?

Here is how to treat and manage swollen lymph nodes in dogs caused by allergies:

Step 1: Identify the Symptoms

The first step in treating and managing swollen lymph nodes in dogs is to identify the symptoms. If your dog has swollen lymph nodes, you might notice unusual lumps under their skin, particularly around the neck, behind the knees, or near the armpits.

Your dog might also scratch excessively, have red and irritated skin, show changes in appetite or behavior, and may have difficulty swallowing or breathing.

Step 2: Consult a Veterinarian

If you suspect your dog has swollen lymph nodes due to allergies, it’s crucial to consult a veterinarian as soon as possible. The vet will perform a thorough physical examination and may order tests to confirm the diagnosis and rule out other possible causes of lymph node swelling.

Step 3: Implement Dietary Changes

If the allergies are food-related, your vet might recommend implementing dietary changes. This could involve switching to a hypoallergenic diet or conducting an elimination diet to identify the specific food allergen.

Step 4: Use Prescribed Medications

Your vet may prescribe medications to help manage the allergic reaction and reduce inflammation. These could include antihistamines, corticosteroids, or other anti-inflammatory drugs.

Step 5: Environmental Control

If the allergies are caused by environmental factors, you’ll need to identify and control these triggers. This might involve regular vacuuming to reduce dust mites, using hypoallergenic bedding, and avoiding walks during peak pollen times.

Step 6: Regular Monitoring

It’s important to monitor your dog’s condition regularly. Look for any changes in the size of the lymph nodes, as well as improvements or worsening of other symptoms. Regular follow-up visits to the vet can help ensure the treatment plan is working and can be adjusted as necessary.

Step 7: Supportive Care

Finally, provide supportive care to your dog. Keep them comfortable, ensure they’re eating and drinking normally, and give plenty of love and affection. A calm and stress-free environment can help your dog cope better with their allergies.

See also: Where Are Dog Lymph Nodes In Neck? (With Pictures)

When To Seek Veterinary Care For a Dog With Swollen Lymph Nodes Due To Allergies?

It is crucial to seek veterinary care for a dog with swollen lymph nodes due to allergies as soon as possible.

Swollen lymph nodes can be a sign of a variety of health issues, including infections, autoimmune diseases, leukemia, cancer, and severe allergies.

It’s important to have your dog seen by a veterinarian so that the cause can be determined and appropriate treatment can be initiated.

See also: How To Check a Dog’s Lymph Nodes

In Conclusion

It’s clear that allergies can indeed cause lymph nodes to swell in dogs. This reaction is part of their immune response to allergens.

However, it’s important to note that this symptom is relatively uncommon and more likely to be associated with severe allergies or other underlying conditions such as infections or autoimmune diseases.

Please take the time and leave a comment below if this article helped you, or you have any additional questions.

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