Im looking at mine and I still dont know think its 36 .. got the size they advertised for a cocker... We left Wilf in his til he was about 18 months I knew he would nt chew or have an accident .. but it was so routine for him, I was worried about upseting his routine but when we took it away he was fine, just put a bed where it had been . Dont think we'll leave mabel in it as long .. she has nt chewed, wakes up between 6 and 7 in the morning although at the moment dont think id trust her not to have an accident if she was nt in it x