As far as Kate's behavior, I second With Grace's idea about herbal or other 'mare' remedies. I have friends who have done different dosing and it seems to help them. Smart Pak offers several options and might be a place to look for more information on the chemical or herbal solutions.
CW, glad to hear your knee is doing better! Yay!
Hunter, how's the pony doing?
Welcome to the new members.