1) Border collie, notably 2) Dog type 
A working dog is a canine working animal, i.e., a type of dog that is not merely a pet but learns and performs tasks to assist and/or entertain its human companions, or a breed of such origin. In Australia and New Zealand, a working dog is one which has been trained to work livestock, irrespective of its breeding. Within this general description, ...
Dog that works with shepherd to move and gather sheep.
[n] - any of several breeds of usually large powerful dogs bred to work as draft animals and guard and guide dogs
noun any of several breeds of usually large powerful dogs bred to work as draft animals and guard and guide dogs