Hickory Hill Pet Show. May 20, 10:30 a.m. to 2 p.m. Tickets $5 tax-deductible, available at Cheshire Cat. Book Store, 5512 Connecticut Ave. NW.; Hobby Hutch, Solona Village Shopping Center, McLean; and Tree Top Toys, 3301 New Mexico Ave. NW.

Everyone knows his dog, cat or koala bear is the cutest one around. Bring it to the Hickory Hill Pet Show and funnyman judge Art Buchwald might agree. Since categories range from "Cat With the Longest Tail" to "Best Behaved Fish," each animal is sure to be a winner. Ethel Kennedy again opens the grounds of her McLean home for this children's day to benefit Runaway House, a non-profit crisis intervention center. Kids can run an obstacle course, play soccer of tennis with celebrities or, when they run out of steam, just sit and watch a movie. Competitive spirits will have plenty of prize-winning games to try, and hot dogs, ice cream and soft drinks will be sold. Some lucky child will win a trip in a hot air balloon, each pet gets an award ribbon and adults might win a little quiet time with a book under one of Hickory Hill's more remote trees.