Well, she's too shy to play "whisker tag" with the horses- they will lean down to touch noses with her, and she'll shy away... she likes to try to sniff my mare's butt/back legs, so she is only allowed near the horses while on a leash. I have tried to explain to her that she is going to get kicked by doing this, she just doesn't listen

. Licorice has also tried to explain this to her by turning around and giving her the pinned-ear "mare face," but hasn't offered to kick (yet). Slappy met the electric fence her first night here, so the only time she's anywhere near the horses is if I have them out. For obvious reasons, they are not safe around each other yet. If she were a more robust breed, I'd be tempted to let her learn her lesson by getting a kick, but greyhounds have very fine and fragile bones, so if the horse is out, the leash goes on the dog.
Thanks for the comments. She also completely ignores my cats, but some greyhounds have a much higher prey drive. She, thankfully, shows very little interest in chasing anything unless there is a rabbit outside.