What is this thing? Sniff-sniff...
Old socks that your humans won't miss are best; the sock they gave us actually had a hole worn in them, which was good because it gave us another opening to eat the hay from.
Wish you would have given us a sock with two or three extra holes in it!
Later on, Broccoli sat down on the hay sock like it was a giant cushion. This is one of the best toy ideas our humans have had yet (although I'm not sure if it beats the watermelon house). 5/5 stars!