The wall is not intended to be as impenetrable as a prison wall. In other words, not perfect. It is meant to slow down any crossing so Border Patrol may arrive. The wall is most effective in reducing drug smuggling and the illegal/immoral sex trafficking of children. Sure, it will help some with illegal immigration and prevent caravans rushing our border but again it is only part of a border security system. Dogs may be helpful on patrol or seeking out illegals, criminal or otherwise, but they're just one tool in the bag.