I am glad that you responded. There is a really grey area here with dogs with high prey drives. I see dogs every day that have high prey drives and they kill other dogs and cats and rodents, etc. Then I see dogs that recognize other dogs and don't bother them, yet they still go for rodents. And pest control is not necessarily a bad thing.
If you want to work with the dog, the best thing to do is to have a trainer come out and work with you and the dog, using a series of shock collars and rewards to teach the dog appropriate behavior.
And you have to keep in mind that cats are not like any other prey in the world. If a cat runs, a dog is going to chase it and they will be more likely kill it because they are so excited to finally catch it.
In MY situations, we can't take the chance that prey driven dogs will NOT hurt children and other dogs.
But it sounds like your dog is not driven to attack other dogs or small children so there is still hope.
Is this more helpful?
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Thanks!