Shocks from electric fences can be painful but your dog shouldn't experience lasting trauma. If your dog still seems affected after the shock, you should see your vet

Q. Our labrador bitch recently suffered two shocks from an electric fence by the bank of a river. She made a terrible noise but seemed to recover quickly.

However, that evening she was visibly distraught and kept coming over to me trembling and looking for reassurance. She eventually seemed to recover but it was a worrying episode. Can these fences cause long-term damage and should dogs instinctively know to avoid them?

A. While most shoots try to ensure electric fences are switched off, that doesn’t avoid a case like this. I loathe them as it’s almost impossible to teach a dog to steer clear.

Dogs that do receive a ‘thud’ can go into spasm. This can even occur long after suffering a shock. Trauma can also be caused to the area that received the shock and possibly result in pulmonary edema.

Standing on a strand of an electrified wire with a rubber-booted foot to depress it to ground level is the normal practice but many dogs fail to actually see the wire. Some may attempt to jump when given the command, but all too often they catch a back foot. That’s certainly my experience anyway. When it happens it does cause distress to the dog no matter what anyone says. I have seen youngsters yelp for some minutes afterwards and even display muscle spasms. Dogs can often appear nervous because they feel they’ve been unfairly punished for something. There can undoubtedly be both physical and mental repercussions.

Your bitch showed clear mental and possibly physical trauma despite the time lapse following the shock. If there had been any prolonged display of after-effects I would have urged you to seek immediate veterinary advice. However, long-term damage is unlikely from an electrified fence providing the shock is not prolonged.

I don’t think dogs can instinctively learn how to avoid electric fences. When I encounter a live electric fence on a shoot day, and someone kindly steps on the wire to allow dog handlers to cross it, I always make sure each dog is safely lifted over the wire – even though it may be at ground level.