NO! You need to confirm before setting stimulation that the collar is working perfectly. For this purpose, every system offers a dummy collar effect, which only blinks the light, whenever the dog goes out of the boundary.  If you find the lights blinking, even inside the zone, then never configure this unit and return it as soon as possible. Otherwise, your dog will keep getting stimulation for no reason that could lead to his aggressive behavior. Tip: Test the fence system with a dummy collar effect for at least 3-4 days.