Can Dogs Develop Allergies Later in Life?

While many pet owners expect allergies to appear early in a dog’s life, it's entirely possible for dogs to develop allergies later on, even after years of seeming unaffected. If your adult dog has started showing unusual symptoms like itching, ear infections, or digestive upset, it might be more than just a passing issue. Understanding how and why allergies develop in older dogs can help you take the right steps to keep them healthy and comfortable.
 

Understanding Canine Allergies

Allergies occur when a dog’s immune system overreacts to a normally harmless substance, such as pollen, food ingredients, or flea saliva. While some dogs may show allergic reactions as puppies, others may not develop symptoms until they’re older. Like humans, a dog’s immune system can change over time, which may explain why new allergies develop later in life.
 

Common Types of Allergies in Dogs

• Environmental Allergies: These include pollen, mold, dust mites, and grass. Dogs may develop seasonal allergies that worsen at specific times of the year.

• Food Allergies: Dogs can suddenly become intolerant to an ingredient they’ve eaten for years. Common culprits include beef, chicken, dairy, wheat, and soy.

• Flea Allergy Dermatitis: Some dogs develop an allergic reaction to flea bites, even if bitten by just one or two fleas.

• Contact Allergies: Less common, but dogs can react to materials like certain fabrics, shampoos, or lawn chemicals.
   

Symptoms to Watch For

Later-onset allergies may appear as:

• Constant scratching or licking

• Red, irritated skin or hot spots

• Ear infections or head shaking

• Gastrointestinal issues (vomiting, diarrhea)

• Watery eyes or sneezing
   

These symptoms can mimic other health issues, so it’s important to seek veterinary evaluation if they arise.
 

Diagnosing and Treating Dog Allergies

If you suspect your adult dog has developed allergies, your veterinarian will typically begin with a thorough exam, a review of your dog’s history, and potentially allergy testing or elimination diets. Treatment options may include:

• Antihistamines or anti-inflammatory medications

• Special diets or food trials

• Allergy shots (immunotherapy)

• Frequent bathing and grooming

• Flea prevention regimens
   

Get in Touch with Brekke Veterinary Clinic

Yes, dogs can develop allergies later in life, and these allergies can impact their quality of life if left untreated. The good news is that with proper diagnosis and care, most dogs can find relief and continue to live happily and healthily.
 

If you’re concerned your dog might be developing allergies, schedule a wellness exam with Brekke Veterinary Clinic for customized treatment plan. Visit our Aloha Street location in Castle Rock, Colorado, or call (303) 474-4260 to book an appointment today.