Hi all, I have had 2 cats for about 2 months or so now. They are rescue cats and 12 years old. They were in and outdoors cats originally but then had to be kept in at their foster home and obviously when I first had them too. They always used the litter tray fine. Since being allowed outside I'm sure they go to the toilet outside but I leave the litter tray out, mainly because when I have removed it at night there have been a couple of accidents (there is no catflap). Most nights they don't use it though. What is annoying me is that I have noticed sometimes Millie chooses to use the litter tray in the day even if the door is open. The other day she came in from outdoors and went straight to the litter tray! Our garden is lawned but there is access to plenty of other places she could use so I'm sure it's not lack of options. I just wonder how I can persuade her to go outside? When I hear her start to use the litter tray I move her outside but not sure if this is having any effect! Any ideas? My other cat Max I haven't noticed the same problem at all but he is generally much happier outside than Millie, she generally chooses to go out for shorter periods.