Humane advocates descended upon Lawyers Mall on Valentine’s Day to “show the animals love.” The rally, organized by the Humane Society of the United States and other groups, demonstrated the strong, bipartisan public support for key animal welfare bills before the Maryland legislature this session.

We zigzag from tree to tree, seeking refuge under the leaf umbrellas. Drizzle turns to deluge as we dash beneath a tall canopy to plot our escape. The sky booms. My dad takes my hand, and I look up to see if he shares my sense of foreboding. But he’s smiling at me, his eyes twinkling. He says...