After the vet came and wasn't much help other than to prescribe bute and rest, I called our chiro and she was very informative, she knows spines!! She didn't feel anything broken, thought maybe his spinous ligaments that connect the spinous processes that stick up were torn. She said his shoulders were definitely swollen, gave us exercises to do to keep his shoulders from freezing up, poll stretching exercises. I need to have her come again. She said she'd need to come several times but also agreed he wasn't in any shape to go in a trailer. He definitely feels better. His bute dose is way down and he's moving around better, stiffer in the morning and better in the afternoon. He's actually cantered, very stiff and upright but his legs are absolutely fine :) He lies down flat a lot more than he used to. I don't have a barn, just a pole corral shelter so he uses that for shade and I gave him lots of shavings to lie in and he loves that. I hope he will be able to come out of this functional. It breaks my heart to think he might not...... I want some answers and I know there isn't always an obvious answer. He's too young (7) and athletic to turn into a pasture pet.