Hi. We built an enclosure for our cat, he loves it and go outside all the time. The only problem is we didn't build a roof for the enclosure and I think its a bit too much sun for him to stay outside for too long. So I was thinking to plant some vines on one side of the enclosure so he will get some nice shade when the weather gets hotter. I was searching for some fast growing vines and people suggest moonflower and morning glory, however they are both toxic to cats. I was wondering if there's fast growing vines that is not toxic to cats? thanks :)