If you mean me, I can tell you about what we did.
First off, every dog that I ever had except one was raised with cats. When they were little puppies, they would try to chase the cat and the cat swatted them on the nose. They developed a deep respect for cats and they never noticed that they weigh 100 pounds and the cat only 6 pounds. This is by far the best way.
I did have a dog that was given to me as an adult. He killed and mutilated my daughter's beloved cat. My first reaction was to put him down, but I decided to try to train him. I would take him out on the leash to start with. If he even walked toward the cats, I would jerk his dang head off. If he chased them, I took a riding crop to him. Since he was so stubborn, it got so that basically even looking toward the cats earned him a whipping. He did leave our cats alone. He didn't like it, but he learned to out of respect for me (or the riding crop). I never totally trusted him alone in the house with the cats. He was a fairly aggressive dog anyway, so he was in the pen unless I was with him. He was a great horseback riding dog. He ran in front of the horses and kept the path clear of wildlife.
I will never accept a grown dog that is not totally cool with cats, horses, chickens, and children again. It was too much trouble and too much heartbreak. If I were going to try it again, I would use an electric collar. But I'm not going to. There are too many nice dogs available.
Puppies learn so much easier.
I didn't mean you, but thank you. I thought he, colocityboy, had been saying something about how he introduced his dog to cats and geese or something.. ha ha Must've imagined it.
Anyway.. I was going to say something similar to what you said. That's how I've always introduced dogs to cats.. They may be very laid back and have great re-call, but eventually they're going to give chase and get swiped.. Then they never do it again. That's how it went with my two dogs, and how I believe it generally goes. Yours is a sad exception.
I was just trying to gain insight as to his training methods and I was wondering why, if they work so well, they can't simply be applied to the girlfriends horse.. I assume she can handle her horse well, and if his dog is well trained, there really should be no issue.
But anyway.. I think its just a lot more simple to allow their natural instincts to kick in and learn the lesson themselves. The lesson will be more ingrained.
Just like.. Kids and electric fences. They never believe you that its hot until they find out on their own. No one wants their kids to get shocked, but once they do, they don't mess with it again.