I finally found a place that has some wooden spools that I can have for toys for my goats. I will be having Nigerian Dwarf goats. My question: I got some small spools (2 ft. high) but want some taller ones. I can get some that are 4 feet high. Is that too high? Would the goats try to jump off them and get hurt? I wanted to put two spools about eight feet apart and put a wooden bridge (using like a 2x6 or such) between them for the goats to walk across.