yes, take the ladders out, their feet can get caught up and they can break a leg... possably needing amputation.
i have both. i love the fns because both sides of the doors open. if you use the fiesty ferret and use the metal bar tray thingy, you have to cover it with something becaues the bars are too far apart, his legs will get caught threw them. with the fn, you can order pans from bassequipment.com and they fit perfect and work perfect. they sit on top of the metal bars.
i took my metal bars out of the fiesty ferret and put fleece over the plastic tray. i have to call bass to see if they have a metal try for that cage also. on the fiesty ferret, both sides of teh doors do not open.
its not a bad cage tho if you don't want something as big as the fn. any other questions, please ask.
j