Rectal prolapse is a condition where, for some reason, the rectum is pushed out of the body. The tender mucus membranes become dried and cracked, causing more irritation and straining. In some cases, the lamb can prolapse its entire intestinal tract, and die of shock.
The act of coughing puts pressure on the rectum and can be one of the initiating factors in rectal prolapse. This condition is usually seen in fat ewe lambs. Ewe lambs tend to have more internal fat than wether lambs and this is believed to contribute to rectal prolapses. Any problem causing diarrhea increases irritation to the area and promotes straining. Therefore, it increases the chances of rectal prolapses. The prolapsed rectum is easy to recognize. It protrudes from the anal area and is bright cherry red. Rectal prolapses must be taken care of right away or you run the risk of having the lamb prolapse its entire intestinal tract.
Call your veterinarian.