Moraine State Park will be the site of "Who Let the Dogs Out?" at 10 a.m. Saturday. Canine lovers are invited to bring dogs to the park for exercise and a swim. A park naturalist will meet participants at the Pleasant Valley picnic area on the South Shore and will lead a moderate two-mile hike followed by a doggie swim in Lake Arthur. Pets must be on a leash at all times. Call 724-368-8811.

Jennings Environmental Education Center will hold a two-day fly fishing clinic from 10 a.m. to 3 p.m. Saturday at Jennings and at an off-site stream Sunday for those age 10 and older. The fee is $15 and registration is required. Children's summer programs are available. Jennings is open from 8 a.m. to 4 p.m. weekdays and on weekends as scheduled. The trails are open daily from sunrise to sunset. Call 724-794-6011 to confirm programs.

<B>McConnells Mill State Park</B>, Slippery Rock Township, Lawrence County, will open the grist mill May 23. Call 724-368-9320.