Small Intestinal Bacterial Overgrowth

Small intestinal bacterial overgrowth describes a situation in which bacteria that normally live in small numbers in the small intestine begin to multiply beyond their usual population. This can disrupt the digestive process, particularly the way nutrients are absorbed from food as it passes through. Owners often notice persistent or recurring diarrhoea, sometimes with a lot of gas or a particularly unpleasant smell. Weight loss may develop over time despite a normal or increased appetite, and some dogs or cats appear generally less comfortable after eating. The pattern can be subtle at first, and it may take a while before the picture becomes clear. This page explores the signs that may suggest bacterial overgrowth, what may be happening in the gut to allow it, the ways it can be investigated, and the approaches that exist to address it. The aim is to help you understand the condition and the shape of the conversations that may follow.