Yeast Infections in Dogs: What to Know

Yeast infections are a common issue in dogs, particularly in certain breeds. Dogs with weakened immune systems and underlying health conditions are especially susceptible. Although yeast infections can develop anywhere on the body, they are most commonly seen in the ears. Early identification and treatment are important to help prevent discomfort. Prompt care also helps avoid further complications.

What Causes Yeast Infections in Dogs?

Yeast is a naturally occurring single-celled fungus that normally lives on your dog’s skin in small amounts. Problems arise when the yeast begins to overgrow, leading to irritation and infection.

Several factors can contribute to yeast overgrowth, including:

• Food sensitivities or allergies
• Environmental allergies
• Fleas or other parasites
• Seborrhoea and other skin conditions
• Bacterial skin infections
• Hormonal imbalances or endocrine disorders
• Compromised immune function

Ear yeast infections are especially common and are often linked to moisture trapped inside the ear canal. Debris can also trap moisture, particularly after swimming or bathing. Food sensitivities may also contribute. In some cases, underlying ear problems such as eardrum damage, polyps, masses, or tumours can play a role. These issues can create an environment that allows yeast to thrive.

Any dog with allergies is also more likely to develop yeast infections.

Yeast Infections in Dogs’ Ears

A dog’s ear canal is shaped like an “L,” creating a warm, dark, moist environment. Yeast can easily grow there. The two most common types of yeast found in canine ear infections are Malassezia and Candida.

Yeast infections can affect any part of the ear and may cause a range of uncomfortable symptoms, including:

• Scratching or pawing at the ears
• Rubbing the head against the floor, furniture, or walls
• Frequent head shaking
• A strong musty or unpleasant odour
• Brown, yellow, or bloody discharge
• Crusting on the ear flap or surrounding fur
• Redness and swelling
• Hair loss around the ears

Early diagnosis and treatment are extremely important. If left untreated, a yeast infection can spread deeper into the ear canal. This can potentially lead to severe pain and more serious complications such as hearing loss. It may also cause balance problems or neurological damage.

Yeast Infections on Dogs’ Paws

A dog’s paws are especially prone to yeast infections because they regularly contact wet, dirty surfaces. Moisture, debris, and dirt can easily become trapped between the toes and paw pads. This creates the perfect environment for yeast to grow. Grass, weeds, and environmental allergens may also irritate the skin. They can cause small cuts and abrasions.

Many dogs respond to this irritation by licking or chewing their paws. This behaviour can make the problem worse by adding moisture. The extra moisture further irritates the area.

Signs of a yeast infection on the paws may include:

• Excessive licking or chewing of the feet
• Red, inflamed, or irritated skin
• Brown discharge around the nail beds
• Pink or rust-coloured saliva staining on the fur
• Hair loss around the paws

Excessive paw licking can have many causes, including allergies, food sensitivities, parasites, bacterial infections, or injury. Boredom or anxiety can also contribute. Because several conditions can look similar, it is important to have your dog examined by a veterinarian. This ensures an accurate diagnosis and appropriate treatment.

Diagnosis is typically made using your dog’s medical history and diagnostic testing. Skin or ear swabs are often used to identify yeast. These tests can also reveal any accompanying inflammation or infection.

Yeast Infections on the Skin

Yeast dermatitis is a skin inflammation caused by an overgrowth of yeast on the skin. While it can develop anywhere on the body, it is most commonly found in warm, moist areas. These include skin folds or locations where a rash is already present. Dogs with wrinkled skin, such as the Chinese Shar-Pei, are particularly susceptible. Moisture can easily become trapped between folds.

Common signs of a skin yeast infection include:

• Intense itching or scratching
• Red, inflamed, or irritated skin
• Greasy, flaky, or crusty patches
• Thickened “elephant-like” skin
• Darkening of the skin
• Hair loss
• A strong musty odour

Yeast infections that begin in one small area can spread if left untreated. They may sometimes affect large areas of the body, including the face and mouth. In many cases, a secondary bacterial infection may also develop alongside the yeast overgrowth. This combination increases discomfort and irritation.

How Yeast Infections in Dogs Are Treated

Treatment for yeast infections will depend on the location and severity of the infection.

For ear infections, treatment varies depending on how deep the infection extends into the ear canal. Outer ear infections are often treated with topical antifungal creams. Middle ear infections may require medicated ear drops or oral antifungal medication. Your veterinarian may also recommend a thorough ear cleaning. Ongoing use of ear-drying solutions can help reduce moisture build-up.

Yeast infections on the paws are commonly treated with disinfectant sprays or washes. These are often used alongside topical antifungal creams, lotions, or sprays. In some cases, an Elizabethan collar may be needed to prevent excessive licking. This helps the paws remain dry and heal properly.

Skin yeast infections often require both topical and oral treatment. Medicated shampoos may be prescribed to help remove greasy build-up and soothe irritated skin. Antifungal shampoos are typically left on the skin for several minutes before rinsing. They may need to be used regularly for several weeks. If a secondary bacterial infection is present, antibiotics may also be prescribed. These are given alongside antifungal medication.

Preventing Yeast Infections in Dogs

The good news is that yeast infections are not contagious to humans or other dogs. Prevention mainly focuses on keeping your dog’s skin, ears, and paws clean and dry.

Because excess moisture is a major trigger, it is important to thoroughly dry your dog after swimming or bathing. Pay special attention to drying around the ears and paws. Monitoring for early signs such as excessive scratching or licking can also help. Watch for redness, skin irritation, or a musty odour. Early detection can help catch problems before they worsen.

If you notice ongoing symptoms, veterinary care is important to prevent the infection from spreading or becoming more severe.

With proper treatment, the outlook for yeast infections is generally very good. However, underlying conditions such as allergies, hypothyroidism, seborrhoea, or immune-related issues must also be managed. Untreated underlying causes can lead to recurring infections.

Foods That May Contribute to Yeast Overgrowth in Dogs

Certain foods can encourage yeast overgrowth by increasing sugar levels in the body, triggering inflammation, or disrupting gut health. Managing your dog’s diet can play an important role in supporting healthy skin, ears, and immune function.

Foods Commonly Avoided During Yeast Issues

High-Carbohydrate Foods
Yeast feeds on sugar, and carbohydrates are broken down into glucose during digestion. Foods high in starches and carbohydrates may contribute to yeast overgrowth. Common examples include:

• Potatoes and sweet potatoes
• Corn
• Wheat
• Rice
• Oats and barley
• Tapioca and other starch-heavy grain-free ingredients

Sugary Foods
Added sugars and naturally high-sugar foods may worsen yeast issues by providing additional fuel for yeast growth. These may include:

• Honey
  
• Sugary treats
• Fruits high in natural sugars such as bananas, apples, and mangoes

Dairy Products
Some dogs struggle to digest dairy products, which may contribute to inflammation and digestive upset. Foods such as milk and cheese can sometimes aggravate yeast-related issues in sensitive dogs.

Yeast-Containing or Fermented Foods
Foods containing yeast or fermentation products may worsen symptoms in some dogs. Examples include:

• Bread
  
• Fermented products

Foods That May Trigger Allergies or Inflammation
Food sensitivities and inflammation can weaken the skin barrier and immune system. This can make dogs more vulnerable to yeast overgrowth. Common triggers may include:

• Chicken or beef (for sensitive dogs)
• Gluten-containing grains
• Artificial preservatives, colourings, and flavour enhancers

Why Diet Can Influence Yeast Growth

Yeast organisms such as Malassezia and Candida naturally exist on the skin and within the digestive system in small amounts. Problems can occur when yeast begins to overgrow due to excess sugar intake, inflammation, allergies, or a weakened immune system.

This overgrowth may contribute to symptoms such as:

• Itching and irritation
• Redness or inflamed skin
• Musty odour
• Hair loss
• Recurring ear or skin infections

Dietary Support for Dogs Prone to Yeast Issues

Many owners choose to focus on a lower-carbohydrate, nutrient-rich diet to help support skin health and reduce inflammation. Beneficial foods may include:

• Lean meats and oily fish
• Eggs
• Low-sugar vegetables such as broccoli, kale, and green beans
• Small amounts of berries
• Healthy fats including fish oil or MCT oil

Probiotics and omega-3 fatty acids may also help support gut balance, skin health, and immune function.

By reducing foods that may encourage yeast growth, you can support your dog’s overall health. Focus on whole, balanced nutrition to reduce the likelihood of recurring yeast issues.