Intestinal Lymphangiectasia

Intestinal lymphangiectasia describes a condition in which the small lymphatic vessels inside the intestinal wall become dilated, blocked, or dysfunctional. These vessels normally carry fluid, proteins, and fats away from the gut lining and back into circulation. When they fail to do this, protein-rich fluid can leak into the intestine itself, leading to loss of protein, fats, and certain immune cells from the body. Owners often notice chronic or recurring diarrhoea, weight loss despite a normal appetite, or fluid accumulation in the abdomen or limbs. Some dogs develop a dull coat, reduced energy, or episodes of vomiting. The condition can appear gradually or follow a pattern of improvement and relapse, and it tends to affect certain breeds more commonly than others, though any dog may be affected. This page explores the signals that may be seen, the underlying mechanisms that drive protein loss, the investigations used to reach a picture of what is happening, and the range of dietary and medical approaches that exist. The aim throughout is to help you understand the shape of the condition, not to diagnose or direct care for an individual animal.