My cat, who I got just for such a service, managed to chase a mouse through the house not willing to "catch" it until the poor little thing fell into the tub. She peeked over the edge to watch it for a few minutes then decided the fun was over and off she went. I had to get a device to lift it out of the tub, it was terrified but unhurt, and I took it out into the field to release it. I know, I'm sure it made it's way back into the warm and "safe" house but I just couldn't kill it.