Curiosity might be a better word. Control might be a better word than discipline. You must let your Toller know you are the leader of the pack and worthy of its respect and loyalty. Harshness only meets stubbornness. They are very intelligent and will work well with a happy, gentle hand most times.
Tollers live in cities and out in the country.
Training Today's Toller is a very intelligent dog. They respond to many cues of normal family life. Rarely can an owner pick up keys and not find the Toller at the back door. The click of a shell being chambered in the gun will light up the eyes and the dog will raise up almost on tip-toes. Many Toller owners who compete in Obedience report that the dog is happiest when working.