Why a good dog chases
Worrying is not disobedience in the way most owners mean it. The moment stock moves, a dog's prey drive fires a sequence — eye, stalk, chase — and the chase itself is intensely rewarding, which is why a dog who has chased once works so hard to do it again. Herding breeds add their own twist: the instinct to gather and control movement is bred in, and untrained, it comes out as chasing, nipping at heels, and splitting animals from the group. Punishing the dog afterwards teaches nothing, because the reward already happened out in the field.
The stakes run in both directions
Understand what is actually at risk. Chased sheep injure themselves on fences, abort lambs from stress alone, and can die of exhaustion; cattle bunching into a corner can crush a calf. And the dog is at risk too: a farmer protecting stock has strong legal backing in many places to act against a dog caught in the act, and nobody wants that ending. Worrying is therefore not a nuisance behaviour to tolerate until training catches up — the management has to be watertight from today.
The management layer: fences, leads, timing
Start by removing opportunity. The dog's yard access should be fenced or the dog on a lead anywhere stock can be seen at close range, and never loose during the hours when animals are being moved, fed, or lambing. Exercise the dog properly before yard time — a dog who has already run and sniffed arrives with a lower charge. Feed and settle the dog indoors during the yard's busiest stock movements. These measures are not a failure of training; they are the permanent framework that keeps everyone safe while training happens.
Train the recall where it cannot fail
Build the skills away from livestock first. A recall that works in the garden but not in a field is not a recall yet. Practise with gradually bigger distractions — other dogs, thrown balls, a thrown toy mid-chase — and reward the turn-away-from-excitement generously, because you are asking the dog to give up something wonderful. A leave-it that holds against dropped food and moving toys is the other foundation piece. Only when both are solid in open country with no stock in sight is the dog ready to be near animals.
Proofing near livestock, on a long line
Work at a distance from the fence where the dog notices the stock but can still listen — for many dogs that is the far side of the next field at first. Reward calm looking and turning back to you; shorten the distance over days and weeks, never within one session. Any rehearsal of a chase sets the work back, so the long line stays on until the behaviour is boring. If the dog has already caught or injured an animal, or the drive is so high that progress stalls, bring in professional help early rather than late — KinsLe's Pet Services Directory lets you find trusted local pet businesses, including trainers who specialise in stock-proofing farm dogs, and connect with them directly.