I have a problem I have never encountered before. My three year old gelding is very aggressive toward dogs. I have 3 mini dachshunds, and the other day I had Cody in the yard grazing, and my elderly dachshund wandered out into the yard. Cody went after her, chasing her and striking at her with his front feet, and it was horrifying. He very nearly got her, but she ran under the deck just in time I really don't want my dogs (or anyone else's) getting hurt, but am not really sure how to handle this. I suspect he wasn't being vicious, rather he thought it was a game, because his ears were not pinned, they were right forward like he was very interested and curious, but it is a deadly game and I really want to put a stop to it. If anyone else has had this problem or can suggest ways to stop it I would really appreciate the help.