Yes, I'd go for at least 2 big trays. One of my trays is an under-bed storage box, much bigger than the biggest litter tray in the pet shop. I can fill it nice and deep and they have plenty of space to scrabble around and dig.
Yep we are replacing our trays now with the under-bed storage boxes,can get a lot better size choice & we have found them a lot easier to wash out too which is a big bonus...x
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