My very first cat, RB Amber, was an outdoor boy I rescued and brought in. He was restless inside, kept meowing at the door. I bought a leash and harness, and we would walk daily, didn't matter the weather he HAD to go out. We walked around the apartment building TWICE, not once, not three times. I was to stay at the FAR end of the leash and make NO noise. This was his time, to play "tiger in the jungle." If my sneakers scrunched on the gravel, he would throw me a dirty look over his shoulder. We did this for 8 years, until he died of renal failure. Just thought I'd share, in case you were wondering who is training whom.

With 3 cats you should have 3 litter boxes, preferably not lined up in a row. Someone gets grumpy, spreads out across the front to show dominance, and no one can use a box!