Final answer:
Sweeny is a condition in horses characterized by the wasting away of the shoulder muscle overlying the scapula, typically due to injury or nerve damage.
Step-by-step explanation:
Sweeny refers to the condition in horses where there is atrophy or wasting away of the shoulder muscle, specifically the muscles overlying the scapula. This condition can be caused by injury or nerve damage that results in the partial or complete paralysis of the shoulder muscles, leading to muscle wasting. It is often seen in draft horses that are subjected to heavy pulling activities, but any horse can be affected by this condition if the appropriate muscles are injured.