Why? He can get out as we have a cat flap and he does go out sometimes. But more and more often he will pee or poo indoors and it is so frustrating! Is it an age thing? He is very agile still and seems healthy for an older cat but I am at a loss as to what to do. Should I just get a litter tray for him so he can at least do his business in an acceptable place? Thank you all and have a Happy New year.