Urinary Obstruction in Sheep and Goats Urinary obstruction in sheep can arise from various factors, including calculi (urinary stones), tumors, and strictures (narrowing of the urethra). The most common cause is urinary calculi, which can develop due to imbalances in the sheep’s diet or environment. This condition primarily affects lambs raised for meat, particularly castrated lambs, but is rarely seen in females due to their shorter, wider urethras. Tumors and strictures, resulting from injury