To prove that a working sheepdog can become a competent trials competitor, Glyn Jones takes two very different dogs and their handlers through their paces in the scenic Welsh countryside.
Donna Jones is a shepherdess whose dog Zac is one of several working with a large flock of sheep. By contrast market researcher Marion Turner's dog Lynne is kept on a smallholding in the south of England.
The skills of the handlers are assessed by Glyn who encourages more positive commands and corrects common faults. He is joined on the programme by the late Eric Halsall, one of Britain's leading writers about sheepdogs and trialling.

This is the third of a series of three programmes, the others being:

Come Bye! And Away! (The early stages of sheepdog training)
That'll Do! (Widening the sheepdog's experience and reducing command contact)