I love kitties and was so happy to find your group! These are my "3 M's."
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Mickey, 12 yrs old and littermate to Maizey. They are both domestic short hair (actually mediumish length hair). He's about 13.5 lbs, not overweight, just a large cat - long and tall.
Maizey, 12 yrs and littermate...
First, you need one pan per cat, plus one (3 cats and 4 boxes). i would suggest trying different types of litter and make sure it is about 3 inches deep in the pan at all times, and be sure to scoop all of the pans at least once a day, and actually scrub the pan once in a while, as the smells...
You may want to look into calming collars, available on Amazon. Please read through the comments/reviews for safety and DIY collar modifications before using though. When we got a new kitten recently, the older two HATED him and I had to do something so they wouldn't hurt him or start marking...