Cabbage White, the weed of butterflies, on a Dandelion.
Eastern Tailed Blue (the first of the year) on a Clover flower.
Horace's Duskywing of the year. Kind of a rough picture.
Great Spangled Fritillaries. I didn't see any attempt at sex.
Eastern Tiger Swallowtail stopped to puddle in the dirt under Skye's favorite shade tree. She almost ate him.
American Lady (as opposed to the nearly identical Painted Lady). It's the first I've been able to clearly identify this year. Not strictly at the dog park, I spotted it when we stopped at Chesapeake Bounty on the way home.