Machine wash cold, tumble dry low
Earlier, I was shuffling a load of laundry from the washer to the dryer, and asked MB to fetch the hamper of whites from the bedroom. He disappeared into the bedroom, came out holding the hamper, and then ducked right back out of sight, presumably to add his shirt to the basket.
Then he brought the hamper to me, and said, "You wanted whites, right?" When I said yes, he set the hamper down, revealing that he'd added the cat to the load of clothes. I guess I can't fault his sorting abilities.