The bottom surface area is often manufactured from wire to avoid them tunneling out if it is to be put on flat ground at your yard. Lining it having a generous number of straw, Wooden pellets, and also other safe bedding product will guarantee their legs will not get hurt. https://www.google.com/search?sca_esv=113d158847e1780d&sca_upv=1&tbs=lf:1,lf_ui:9&tbm=lcl&sxsrf=ACQVn0-lFCI2XTQV5U-JJuegKDo327xbcQ:1712929826541&q=%EA%B0%95%EB%82%A8+%EB%8B%AC%ED%86%A0&rflfq=1&num=10&sa=X&ved=2ahUKEwjA79fu6LyFAxXFs1YBHcezA5MQjGp6BAgaEAE&biw=1920&bih=953&dpr=1#rlfi=hd:;si:386021914840433506,l,Cg3qsJXrgqgg64us7YagSOviuf72uoCACFoZEAEYABgBIg3qsJXrgqgg64us7YagKgIIApIBGGFkdWx0X2VudGVydGFpbm1lbnRfY2x1YqoBNhABMh8QASIbe3thJA4HjqaXSbrf3XXP2VX9ULAKzSjPKD1uMhEQAiIN6rCV64KoIOuLrO2GoA,y,mAh0l