A Lazy Dog was also called a Red Dot Bomb or a Yellow Dog Bomb is a thumb sized unguided piece of lead kinetic projectile typically about 2 inches by a half inch.
The weapons were designed to be dropped from almost any kind of aircraft. Lazy Dogs were not explosive. But falling at 9.8 meters per second squared gave them a them a lethal velocity when one of these things hit something.
They were dropped in Korea and Vietnam and actually never really evaluated for further combat.