My kitten got her paw caught in the corner of the catpen..it was assembled properly, but her paw got caught and thank god i was home.  She cried and cried and scared me to death.  I had to get help..she hung there by her paw..her ledge was too low..and she could  have died.  Her tongue was red..and she was in pain.  I feel my money was wasted on something i can't use now.