In 1984 Ronald Reagan was President, a gallon of gas cost about $1.20, and an actress got a break as the bikini-clad title character in The Sure Thing. Much has changed in 24 years—except how Nicollette Sheridan looks in a white two-piece.
How does she make time stand still? Credit her golden retriever Oliver. “My dog is my trainer,” she tells PEOPLE. “He insists we run four to seven times a week. Whatever he wants, he gets.”