Have you read Biology of Belief by Bruce Lipton? He explains how DNA can be programmed by our thoughts. And that only around 3-5% of DNA comes from inheritance. That type of figure makes me believe that almost everything can be turned around.
Saying that, I am trying to train my dog not to go hunting for hedgehogs in the garden. He goes wild when he sees one.
By the way, are dogs in the US (who are not strays) allowed to wander freely on the streets? In the UK, a dog can't find a pack unless it lives in a pack, for no dogs are allowed to wander away from the owner.