Yeast Guard

Yeast Guard is a veterinarian-formulated herbal blend for dogs dealing with yeast overgrowth. Built around pau d'arco, olive leaf, and organic goldenseal — three of the most well-documented antifungal botanicals in traditional herbal medicine — it's the Four Leaf Rover supplement for dogs showing the classic signs of yeast imbalance: chronic itching, red or licked paws, gunky ears, a musty or yeasty smell, and recurring skin flare-ups.

Yeast overgrowth in dogs almost never starts on the skin. It starts in the gut — usually after antibiotics, a high-starch diet, environmental stress, or chronic immune challenges disrupt the microbiome. Yeast then builds a protective biofilm around itself, hides from the immune system, and expands. Yeast Guard works on the gut side of the equation, delivering antifungal herbs and medium-chain fatty acids that help the body manage yeast populations naturally — without the collateral damage of repeated antibiotic courses. Available in 35.4g.

The symptoms show up on the skin. The problem lives in the gut. This is the single most important thing to understand about canine yeast: topical shampoos, wipes, and creams can offer temporary relief, but they don't address the underlying microbiome imbalance that keeps producing the overgrowth. Candida and Malassezia — the two yeast species most commonly implicated in canine issues — exist naturally in small numbers in a balanced gut. When something disrupts the microbial balance (antibiotics are the most common trigger, but high-starch diets, long-term stress, and environmental toxins all contribute), yeast populations expand unchecked, release toxins that drive inflammation, and eventually show up on the skin as the visible symptoms owners recognise.

Yeast Guard is designed to work on the root — the gut population — rather than just the visible symptoms. The herbs it contains have been used for centuries in traditional medicine for microbial balance. The modern formulation combines them with medium-chain triglycerides that create a gut environment yeast finds less hospitable.

Pau d'arco — a South American bark used traditionally for centuries to support normal yeast levels and microbial balance. The lead active ingredient in the formula at 500mg per serving.

Organic olive leaf — rich in oleuropein, a compound that supports immune balance and the body's natural defences against yeast overgrowth. Also supports gut lining integrity through its antioxidant action.

Organic goldenseal — sustainably grown. Supports the body's natural cleansing processes and promotes a balanced microbial environment, particularly useful when the gut has been disrupted by diet or medications.

Organic oregano leaf — contains carvacrol and thymol, compounds widely used in herbal traditions for their microbial-balancing properties.

Organic thyme leaf — another traditional antimicrobial herb that complements oregano's action.

Organic fennel and ginger root — gut-soothing herbs that support digestion and help calm the inflammation often present alongside yeast overgrowth.

C8/C10 MCT powder, with caprylic and capric acid — medium-chain fatty acids derived from organic coconut oil. These MCTs help create an internal environment less hospitable to yeast, complementing the herbal action. The formula specifically uses MCT without lauric acid, which is the inflammatory component of whole coconut oil.

Yeast Guard is the choice for dogs showing specific yeast-related symptoms: chronic paw licking or red staining, gunky or smelly ears, a musty body odour that returns after bathing, greasy or waxy coat, brown tear staining, or skin flare-ups that follow a predictable pattern (often worse in heat and humidity). It's particularly useful for dogs recovering from antibiotic courses, dogs transitioning off high-starch commercial diets, and dogs whose yeast symptoms have resisted topical treatment.

For a more comprehensive approach that addresses the biofilm and gut lining alongside the yeast itself, Yeast Guard Plus combines Yeast Guard with Gut Guard and Organ Care Enzyme Support as a 3-step protocol — designed for dogs with more entrenched yeast issues.

Every batch of Yeast Guard is third-party tested for pesticides, heavy metals, and microbial contaminants, with a Certificate of Analysis available on request. Four Leaf Rover holds the NASC Quality Seal — the benchmark for quality control in the pet supplement industry — and is certified Plastic Negative by rePurpose Global, removing twice the plastic from the environment that it creates. Manufacturing is GMP-compliant.

Active ingredients per 1.31g (½ tsp). Source: Four Leaf Rover.

Pau d'Arco Powder 500mg, C8/C10 MCT Powder 310mg, Caprylic Acid 62mg, Capric Acid 41mg, Organic Olive Leaf Powder 100mg, Organic Goldenseal Powder 100mg, Organic Oregano Leaf Powder 100mg, Organic Fennel Powder 100mg, Organic Thyme Leaf Powder 50mg, Organic Ginger Root Powder 50mg.

Free from: maltodextrin, preservatives, synthetics, artificial flavourings, artificial colourings, GMO ingredients, gluten, and dairy.

Give twice daily, mixed into food. Measure according to your dog's body weight using the guide below.

Use for 60 days at a time. If longer use is needed, take a 2–3 week break between courses. Once symptoms clear, transition to daily maintenance with Protect.

Store in a cool, dry place away from direct sunlight. Keep the lid tightly sealed.