I took my old dog to chase rabbits regularly for years and it always cracked me up at how bad she was at it, Bernie. Especially if I took her JRT friend. They would make soooo much noise and while they had their heads - or in the JRT's case her whole body - stuck in a burrow, the rabbits would be running away in all directions behind them. But they loved it.
It was only when my dog got to about 8 that she started to 'get it'. She usually killed one rabbit every time I took her then. She took to ambushing them instead of just chasing them when she saw them run. And I saw it as us doing our bit for the environment.