The best place to walk your dog off the lead is Caddam Wood.
Go to Kirriemuir, and at the BP garage turn left and follow the signs for the A955 to Glenprosen and Glenclova. This road circles Kirriemuir to the North. You eventually come to a T junction. Turn left here still following the A955. A few hundred yards on your left is the Wood. You can park in the lay-by on either side of the road and you will see a sign saying Caddam Wood. My dog loves it there.
(Walking in the woods behind the cottages is not recommended as this is a sporting estate and there could be shooters about, after pheasants or deer.)