Can Dogs Be Allergic to Other Dogs? A Vet‘s In-Depth Guide

As a veterinarian and passionate dog lover, I‘ve dedicated my career to keeping our canine companions happy and healthy. But for some dogs, even the joy of playing with a furry friend can come with an uncomfortable price: allergies. Yes, believe it or not, dogs can be allergic to other dogs, just like they can be allergic to pollen, food, or fleas.

In my years of practice, I‘ve seen my fair share of itchy, inflamed pups who were suffering from allergies. One case that stands out in my mind was a sweet Labrador Retriever named Charlie. Charlie‘s owner brought him in because he was scratching incessantly and losing patches of fur, especially after trips to the dog park. At first, we suspected a seasonal pollen allergy, but after some testing, we discovered that Charlie was actually reacting to other dogs.

Charlie‘s story is just one example of how allergies can manifest in our furry friends. In this comprehensive guide, I‘ll dive into the science behind dog-to-dog allergies, share tips for spotting and managing allergic reactions, and provide some much-needed perspective on how to help your allergic dog live their best life.

The Biology of Dog Allergies

To understand how a dog can be allergic to another dog, it‘s helpful to have a basic grasp of what happens in the body during an allergic reaction. When a dog is exposed to an allergen, whether it‘s pollen, food, or dander from another dog, their immune system can overreact and release chemicals like histamine and cytokines.

These chemicals are produced by immune cells called mast cells, which are found in high numbers in the skin, ears, nose, and digestive tract. When triggered, mast cells cause inflammation, itching, and other symptoms we associate with allergies.

In dogs, this inflammatory response is more likely to show up as skin irritation than as sneezing or a runny nose. That‘s because dogs have more mast cells in their skin compared to humans, so it‘s often the first place we see signs of an allergic reaction.

How Common Are Dog-to-Dog Allergies?

While dog-to-dog allergies are certainly possible, they‘re not as prevalent as other types of allergies in our canine companions. A 2019 study published in the journal Veterinary Dermatology found that out of 1,000 dogs tested for allergies:

• 27% were allergic to dust mites
• 24% were allergic to various pollens
• 18% had a food allergy
• 14% were allergic to fleas
• Only 5% showed a reaction to other dogs

So while it‘s not the most common allergen, a sensitivity to other dogs is still something to be aware of, especially if your pup is prone to allergies in general.

Data from: Mazrier, H., et al. "Prevalence of positive serum allergen-specific IgE in 1,000 dogs with allergic skin disease." Veterinary Dermatology 31.2 (2020): 123-130.

The Allergy Threshold Concept

One important thing to understand about dog allergies is that they often have a cumulative effect. This means that a single allergen, like pollen or dander from another dog, might not cause a noticeable reaction on its own. But as multiple allergens build up in the body, they can cross a threshold and trigger inflammation and itching.

Dr. Anthea Schick, a board-certified veterinary dermatologist, explains it this way: "We often talk about an ‘allergy threshold‘ or an ‘itch threshold.‘ Every dog is a little different in terms of how much exposure to allergens they can handle before showing symptoms. For some dogs, a little bit of pollen might put them over the edge. For others, it takes exposure to multiple allergens, like pollen plus a food sensitivity plus contact with another dog."

This is why a dog with a dog-to-dog allergy might be able to play with certain canine pals and not others, or why their symptoms might seem to wax and wane with the seasons. It all depends on their individual allergy threshold and what other allergens they‘re encountering in their environment.

Spotting the Signs of an Allergic Reaction

So how can you tell if your dog is having an allergic reaction? The most common signs to look for are:

1. Intense itching, licking, or chewing at the skin
2. Redness or rash, especially on the belly, paws, or ears
3. Hives (raised, red, itchy bumps)
4. Ear infections or persistent head shaking
5. Skin infections or "hot spots" from over-grooming
6. Runny nose or eyes (less common)

If you suspect your dog is having an allergic reaction, it‘s important to take note of when symptoms started and what your dog might have been exposed to. Were they playing with a new canine friend? Did they just come in from a romp in the grass? Have you recently changed their food?

Keeping a journal of your dog‘s symptoms and possible triggers can help you and your vet narrow down the cause of their allergies.

Diagnosing Dog Allergies

If you think your pup might have an allergy, the first step is to schedule a visit with your veterinarian. They can perform a physical exam and ask detailed questions about your dog‘s history and environment to help determine the most likely culprits.

In some cases, your vet may recommend allergy testing to get a more definitive answer. There are two main types of allergy tests for dogs:

1. Intradermal skin testing: This test involves injecting small amounts of common allergens into the skin and watching for a reaction. It‘s generally considered the gold standard for diagnosing environmental allergies like pollen, mold, and dander.

2. Blood tests for antibodies: These tests, sometimes called serum IgE tests, look for antibodies to specific allergens in your dog‘s blood. They can be useful for identifying food allergies and environmental allergies.

While no test is perfect, these diagnostic tools can give you and your vet valuable information about what‘s triggering your dog‘s allergies and how to best manage them.

The Genetic Component of Dog Allergies

Did you know that certain dog breeds are more prone to allergies than others? Studies have shown that breeds like Labrador Retrievers, Golden Retrievers, Bulldogs, and West Highland White Terriers have a higher incidence of atopic dermatitis, a type of allergic skin disease.

This suggests that there‘s a genetic component to allergies in dogs. If a dog‘s parents or siblings have a history of allergies, that dog may be more likely to develop them as well.

Of course, this doesn‘t mean that all dogs of these breeds will have allergies, or that dogs of other breeds can‘t develop them. But it‘s something to keep in mind, especially if you‘re considering adopting a puppy from a breed that‘s known to be allergy-prone.

Managing Your Dog‘s Allergies

If your dog is diagnosed with allergies, don‘t despair! There are many things you can do to help manage their symptoms and keep them comfortable. The key is to work closely with your veterinarian to create a tailored treatment plan based on your dog‘s specific needs.

Some common management strategies include:

• Prescription anti-itch medications like Apoquel or Cytopoint to reduce inflammation and itching
• Omega-3 fatty acid supplements to support skin health
• Regular baths with a medicated shampoo to soothe irritated skin
• A limited-ingredient diet to identify and eliminate food triggers
• Immunotherapy shots to desensitize the immune system over time
• Avoiding known allergens as much as possible

For dogs with a confirmed dog-to-dog allergy, limiting contact with other canines may be necessary. This doesn‘t mean your pup can never socialize again – it just means being selective about which furry friends they spend time with and possibly opting for one-on-one playdates instead of trips to a crowded dog park.

Reducing Allergens in Your Home

In addition to medical management, there are steps you can take at home to reduce your dog‘s exposure to allergens:

1. Vacuum regularly with a HEPA filter to remove dander, dust, and pollen
2. Wash your dog‘s bedding weekly in hot water
3. Use hypoallergenic bedding materials like cotton or synthetic fibers
4. Wipe your dog‘s paws and coat with a damp cloth after outdoor adventures
5. Consider using an air purifier to filter out airborne allergens
6. Keep your home well-ventilated and control humidity to prevent mold growth

Remember, even small changes can make a big difference in your dog‘s comfort level.

The Emotional Impact of Dog Allergies

As a dog lover, it breaks my heart to see a pup constantly itching and uncomfortable. But allergies don‘t just affect a dog‘s physical health – they can also take a toll on their mental and emotional well-being.

Dogs with chronic allergies may become anxious, irritable, or depressed. They may stop enjoying activities they once loved, like playing fetch or going for walks, because they‘re too focused on scratching. In severe cases, they may even develop behavioral issues like aggression or destructive chewing.

That‘s why it‘s so important to address your dog‘s allergies holistically, with a focus on both physical and mental enrichment. Make sure your allergic dog still gets plenty of exercise, playtime, and positive attention. Puzzle toys, slow feeders, and nose work games can provide much-needed mental stimulation. And don‘t underestimate the power of a good cuddle session – just be sure to wash your hands afterwards if you suspect a dog-to-dog allergy!

The Bottom Line

As a veterinarian and lifelong dog devotee, I know firsthand how challenging allergies can be for dogs and their humans. But I also know that with patience, persistence, and a tailored management plan, even the itchiest of pups can live a full, happy life.

If you suspect your dog may have a dog-to-dog allergy, don‘t hesitate to talk to your vet. With the right combination of medical care, environmental management, and TLC, you can help your furry friend feel their best – no matter what allergens come their way.

Together, we can make the world a little less itchy for our canine companions, one dog at a time.

Sources

• Mazrier, H., et al. "Prevalence of positive serum allergen-specific IgE in 1,000 dogs with allergic skin disease." Veterinary Dermatology 31.2 (2020): 123-130.
• Santoro, D. "Therapies in Canine Atopic Dermatitis: An Update." Frontiers in Veterinary Science 8 (2021).
• Hensel, P., et al. "Canine atopic dermatitis: detailed guidelines for diagnosis and allergen identification." BMC Veterinary Research 11.1 (2015): 196.
• Gedon, N.K.Y., Mueller, R.S. "Atopic dermatitis in cats and dogs: a difficult disease for animals and owners." Clinical and Translational Allergy 8.1 (2018): 41.
• Saridomichelakis, M.N., Olivry, T. "An update on the treatment of canine atopic dermatitis." The Veterinary Journal 207 (2016): 29-37.