Thanks for your responses. I have done pretty much everything backinthesaddle suggested. He was blanketed all winter, has been trailered 3 times (we are still working on that
), crosses water, etc. he's really not afraid of anything that I've introduced him to yet, other than the occasional jump due to loud noises or something. He's really an awesome little colt, Im so proud of him! I really want to pony him and he's super bonded to my lease mare, so hopefully I can try that soon. He's been around bikes and cars a lot, as we have lots of kids that ride bikes at the barn. Thanks so much guys!