Dog training question.

My one-year-old female Border Collie wanted to herd/chase the horses. Was trying a shock collar for a short time, but she died suddenly one day we left home for a few hours shopping. So my experience with the collar very limited.

Our two-year old female Doberman can't resist chasing cats, chickens, kids. On leash, under quiet conditions, she will stop walking automatically as soon as I stop walking without any command at all. She will also stop with the verbal command "Stop" under the same conditions.

However, in the presence of a cat or any moving thing (child, animal, ball) she has to run after it and completely ignores any of my vocal commands. After training on leash with the average common-place leather collar for six months now, it appears she might just be starting to resist darting after things. Maybe after a couple of more years, or, at this rate, maybe never will she behave calmly.

I will keep trying my slow, patient way/method as a kind of experiment to find out if it is even possible to calm her down completely to the point of trusting her off leash! For some reason, I just don't want to resort to the shock collar with this animal.