Great list Red Roan!!! I copied and pasted it here for a reference should we not be able to access that link in the future. :)
~ Sweet Potatoes
~ Watermelon (both rind and pulp)
~ Any other members of the nightshade family which includes peppers
~ Broccoli or Cauliflower (may cause gas, which in turn may cause gas colic)
When in doubt, do NOT feed it!
Syrup should be fine if you're using it to mix something or mask something. But I'd get molasses if I had to do that...
Be strong and courageous, and do the work. Don't be afraid or discouraged by the size of the task, for the Lord God, my God, is with you. He will not fail you or forsake you.
1 Chronicles 28:20