Here's the other side of the coin, though:
My dog, a chow/pit that is an extremely dominant bitch, started becoming more and more dominant/aggressive as she got older. At about 2 years of age, I had tried everything from correcting her with the prong, to using treats to try and distract her from the other dog (she completely ignored the treats), to running in the opposite direction of other dogs, to taking her out with a muzzle and expecting her to behave badly when we encountered another dog. She wasn't going after the other dog to attack it; she did want to play, but she felt like she had to dominante it first, and though she never did get into a fight with another dog, I was afraid it might happen one day.
Then, I decided to consult with a trainer. The first trainer suggested using a SENSE-ation harness and a clicker. That was a joke. The first time I took her out in public with it, she saw a rabbit, jerked the leash out of my hand, and took off across a field after it. She then got tangled up in a briar thicket, where my husband had to go and get her out of. This would never have happened on her prong collar. <img src="/ubbthreads/images/graemlins/mad.gif" alt="" />
I had consultations with two other trainers that, despite their advertising, said they could not help me because my dog was already very well trained as far as obedience went.
Dog Training in Your Home was the one that I finally ended up using. Long story short, we used a clicker
and leash corrections starting with the prong, and then with the e-collar (so she'd understand this correction and respond correctly even off leash - and so onlookers wouldn't see me correcting her with the prong and think I was abusing her or whatever). I discovered that though I had tried giving her leash corrections, I just wasn't doing it hard enough in these particular situations. What I was actually doing was agitating her. On a scale of 1-10, I had been giving a 4 I guess. It took a level 9 or 10 to get her to understand that the behavior was NOT appropriate. The clicker and treats we used whenever she was behaving nicely (showing interest in the other dogs without showing aggression, showing play behaviors, etc.) However, the second she showed any aggressive behaviors, she got a verbal correction and a correction with the prong collar (then the e-collar).
It only took a few sessions of working at the dog park outside the fence, before she understood that it wasn't the other dog(s) causing the correction, but her inappropriate behavior. Eventually, we were actually able to let her loose inside the fence without her exhibiting any dominance or aggressive behaviors towards the other dogs.
So in short, I'm just trying to say that correcting for this type of behavior CAN work, but that I also used a clicker to let her know when she was behaving correctly.
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