Jack Russell Needed For Ratting - Bucks

Has anyone used a pack of Jack Russells to get rid of any rat!!.  We've seen two in our garden, and i know there will be many more.  Now i've purchased a box from B&Q but i swear they are too big to get into it!!  As i am a big animal lover, apart from rats!!!, i was wondering if anyone has used terriers for ratting, if so, where did you find them and can you point me in the right direction!  Now some of you may accuse me of being cruel, it isn't, jack russells were breed for ratting and its a quick and simple way of getting rid of the rats.

Hi,
I have two Jack Russells, great at keeping the rat population down. They are not very happy at the moment as we have moved and the rats haven't found us yet
Sorry I live in Kent, so too far away to let you borrow them.
They are also great with the chickens and chicks, they have been bought up not to touch anything with feathers, one of them even caught an escaped quail and bought it back to me alive. 

Michelle

whilst locking up one night we trapped a rat in the chicken shed so my father shouted to fetch  my sisters jack russell bitch down {lives a few doors away} , my sister has got a pet ferret that actually lives freely in their house {no cage} and this bitch actually plays with the ferret and sleeps with the ferret in my sisters bed {its unreal}.
anyhow we sent the dog into the shed and turned the lights on , the chickens were up on their perches the rat ran straight up the wooden wall and was clinging onto the ledge just behind the chickens one of the chickens pecked the rat and the rat leaped onto the perch then another chicken pecked and threw the rat down onto the floor where the dog killed it .
i was then panicing the dog might kill the ferret but the ferret still rules the house 

As much as I'd like to help you out, (esp as I'm also in Bucks), I couldn't lend her to you as she came from a rescue and would think I'd given her away, poor thing. What about using those green box things with poison in them, if you fixed a wire cage around them with holes big enough for the rat to get through but safe from your chooks?