2yr. old male GSD in shelter

Question
Hello, I have a question regarding a GSD I found in a shelter near my home. The poor guy is in bad shape; HW positive, severely malnourished, and facing possible tail amputation. The conditions of the shelter he is in are deplorable. I want to adopt this pup badly, but the woman at the shelter said that he kills cats. I have several cats so I obviously did not take him home. This was yesterday and I have been up all night worrying about the poor guy. I want to get him out of there. Do you know if it's possible to work with an adult German Shepherd and teach them not to hurt cats? If it's possible, then I will do it. He is such a sweet guy. Thank you so much!

Answer
It may or may not be possible.  I am not the one to be able to help.  

I am afraid you should let him go and look for another dog.  The sad thing is, we can't save them all.  If you adopt him, some other dog will die instead.  One of the best sources for dogs with a predictable personality is the rescue dogs. These are dogs that lost their home, but were taken into a foster home to be retrained as necessary and placed in the right home for them. You may find a rescue near you starting at http://www.akc.org/breeds/rescue.cfm The rescues charge a fee to help cover their expenses, but is much less than the price of a puppy plus all its medical expenses the first year.