Evie refuses to access the aerial cat run from indoors (the access is through a tunnel through the wall in the bathroom onto an aerial walkway about 10ft above the ground). The walkway is 4 inches wide and has a huge platform about a foot from from the tunnel entrance. She will stand at the end of the tunnel but will not walk across. I have to take her outside and put her in and out of the run from the outside. She climbs up the vertical posts which reach the walkways but will not walk on them. Whoever heard of a cat with acrophobia.