Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to feed a starving horse [title] Identify if the horse is starving. [substeps] It will have skin stretched tightly over its body. It will also have a very bony, concave face.

Ending1: There will be tiny pups in the mouth, and these pups will eat as your horse feeds them. This part of the horse's body does not have very much meat. Ending2: Artery loss occurs when a horse's heart stops beating. Blood in the body loses its nutrients immediately. Ending3: Take a stool sample just to get a test of it. If it is plump, the horse may be in fact starving. Ending4: Its neck will most likely be extremely thin. Its back will be bony and its shoulders should show clearly through the pelt.

Answer format: ending1/ending2/ending3/ending4