my last cat is completely gone from alone on the toilet, which was a blessing! Now I have found this product and verusche it out on my two tomcats. Both have different Charektere and respond differently to this device. First ring was immediately accepted and have both gone dadrauf. even always peed only in the middle, due to the grooves in the floor. Quite nice, because that saves space in the small bathroom and gives hope. Now, after weeks is the second ring to it (with the hole) and runs very very bad. At first I felt both rather have constipation, now one is always in the bathtub do his business, and the other used it already, but so rare that I think he's waiting until he can no longer really different. And all for a week .. I'll still few days watching the whole course and the reward immediately when make everything right. However, if this goes on I have to get the normal litter box out of the basement.