Q. My horse was pregnant, but suddenly became very skinny. She lies down and she looks like she may be having pains. She is always calling her mate,also.
A. It is possible that she lost/aborted the baby and is calling for it. I would have the vet check her (palate) to see if she is still in foal. It's unlike a horse to become that skinny (though when babies roll they can really change a mates shape) and distressed. If she is laying down and having pains she could also be colicky. I would have her checked to make sure it's nothing.