Guss,
Be careful with the training methods that you use on your dog, or you may end up with one confused dog. Most training techniques are based on training a young dog or pup. Since your dig is older, you may need to use some different techniques that are based for older dogs. I would suggest talking to Jonesy about this, as I know he does a lot of corrective training for people. I am sure he will comment in this issue soon.