My dad bought the boys an outdoor exercise pen almost 2 weeks ago. We put them in it, and Rascal found out he could squeeze through the bars, and showed Renegade how to do it. So, we had to make it ferret escape proof. My dad and I finally found some stuff and did it today. We through the boys in there to make sure they could not get out still, and they could. So in these pictures there is only one layer of plastic on it... we put another layer on just above it. Tried Renegade with it again and it is now ferret proof. Just a few pictures, there are 50 forest fires in Quebec (the next province over) so our air is all smokey and I did not want to risk keeping the boys outside for too long. All done!