Hi everyone, I am puzzled and a little worried. I am the mom of a loving and dependable black quarter horse gelding who has turned 23 years old this May. He is a very healthy, easy keeper with awesome body condition. Looks and acts as if he were only a young boy, no arthritis in any joints. Today we went for a short ride and when we returned home I let him eat some grass while I was on him. Then he stops chewing and his head started to quiver abit then immediatly stopped, about a minute or two went by then it began again but followed with his body quivering and he almost went down, he fought to stay on all four and god love him he did. I kept saying his name<Smokey, Smokey and keep patting his neck as if trying to wake him up. Then it was gone and he was back to normal. I remember that he has done that a couple of time before, but only the lip and head quivering like he had something awful tasting, not as severe as the body this time. But immedietly he snaps out of it. Anyone have any ideas what this is caused by? Is it like a seizure from being an older horse? I am afraid that might be the way he goes when it is time for him too move on, I cannot and do not want to imagine, but I also worry what if this happens out on a trail ride!