My old cat (18 years) loves ... it has a fenced park of almost 1/2 acre. it is a Siamese who gives voice ... so we hear !!! I thought he was bawling because he wanted to get out ... even at 3 in the morning !!! After a few moments he returned and was heading in his Cabinet personal and relieved on his litter ... nature is good but it is not worth Catsan. as it is very clean and it covers its droppings there are always a few grains flying to the floor through the door .. But the pepere Catsan recommended for all cats