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Saccharomyces cerevisiae is a yeast that can be detected in the gastrointestinal tract and is commonly known as baker’s or brewer’s yeast. In a dog’s gut profile, its presence may reflect exposure from diet, fermented ingredients, yeast containing supplements, or temporary passage through the gut. Higher levels can suggest that Saccharomyces cerevisiae is not only passing through, but that the gut environment allows this fermentation associated yeast to remain detectable or increase. This may happen when the balance between bacteria and fungi is disrupted, or when the intestinal environment supports more yeast fermentation. Higher levels may be seen alongside altered stool quality, gas, bloating, digestive changes, or signs of increased fermentation in the gut. Saccharomyces cerevisiae levels can help show whether diet or supplement related yeasts are influencing the dog’s fungal profile.

