I noticed a lot of towels used for various things in the cage pictures and I used one to cover a tunnel I made out of a grid and (the towel is intact) drape the towel over the cage so it makes a tunnel and a hidey hole...my concern is that I notice my one piggie started to chew on it and pull some threads loose!! I am worried this might harm them if they eat the towel or maybe cause blockage??? So if anyone can help me out here I would be very thankful