Doodle acts like he is choking. He ate his breakfast this morning, but right after that I noticed him sitting in a quiet part of the barn, and he was making a funny chortling noise. I went back in a few minutes later and he was gulping, like he was choking, or something was stuck in his throat. He appears to be breathing ok and struggled when I picked him up, he was plenty strong. So I left him where he was, but what can I do?