I got one originally becuase my ACD would chase and
nip the horses. (She was a rescue at year old, so missed some critical
training and socializing months). The collar was a last resort....and even
on the strongest shock, it did not deter her....the heeling instinct was just
too strong....
Put the collar on your arm first, then test it. I used one
on my shepard when she would run the pony. I was told to make sure she was
corrected the first time, make sure the pulse was strong enought to get her
attention. It did. She yelped for at least 30 seconds. I felt horrible. It
stopped her from running the pony, putting him through a fence or getting her
head kicked in. For other correction, trying to eat other dogs, I made sure
the shock was much less, just enought for a reminding tickle. Beccy