Hi everyone. I have two wonderful cats. Lavender is a three year old male (Yes, I know the name isn't very macho - my daughter chose it). He spends lots of time outside and does his 'business' out there too. Destiny is a two year old newcomer to our family. She is spending a little time outside but insists on always coming in to use the litter tray. How can I encourage her to go outside instead of using the tray? Please help! I have a weak stomach and am unused to cleaning litter trays.