Glanzmann Thrombasthenia Great Pyrenees type (GT) is a form of thrombasthenia, a bleeding disorder caused by a disfunction in blood clotting. GT can be divided into three groups, type I, type II and variant GT. Type I is "severe", Type II "moderate" and variant being relatively normal, but with reduced function in clotting. Symptoms can include: prolonged bleeding time, severe bruising, red or purple spots under the skin, nose bleeds, bleeding gums, and pin-prick blood spots on the abdomen. Age of initial onset, from birth. Affected dog appears to be smaller than breed average. The dog will have also prolonged clotting times post-operatively.