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Bacteroides thetaiotaomicron is a gut bacterium involved in breaking down complex carbohydrates and fibre like substances that the dog cannot fully digest on its own. This supports nutrient processing and contributes to the production of compounds that help maintain the gut environment. Bacteroides thetaiotaomicron levels can help show how the microbiome handles dietary fibre and carbohydrate fermentation. Changes in its levels may reflect shifts in diet, digestion, or the balance between different carbohydrate processing bacteria in the dog’s gut profile.

