he will learn to jump em if he sees them in time,other times he will be that split second to late,and all you can hope for is nothing to serious.hearts been in my mouth a few times over the years.ive mentioned this before,but worse incident i ever saw was a dog jumping over a dry stone wall.straight onto a load of farmyyard scrap.i will take the noise that dogmade to my dying grave.felt physically sick.fortunaetly it was not my dog.