I have two Jacks and they are constantly working.We are on a property and they are pretty quick to the rodents.One of mine is better than my Border Collie at rounding.She helps me round the sheep and the cows.Shes great at telling my horse off when he gets a bit over the top.Boy does she love to see any of the other animals getting in trouble,so she can put her two bob in.So many people see Jacks as more of a lap dog,because of their size.How wrong they are!Jacks are a great working dog and thanks to their intelligence can achieve anything thats asked.Incredible dogs!Go the Jacks!!