We have had dogs for all 48 years of our marriage. Our most recent were these three: a 19 year old shih tzu, a 9 year old shih tzu and a 9 year old? puppy mill rescue havanese. The 19 year old recently went to the bridge. We then rescued a 1 year old poodle mix, Louie. He bit me on our first meeting. I thought, "I am ready for a challenge." Our other dogs are registered therapy dogs and I had hopes of a huge commitment for this one, but I am faltering and thinking I have bitten off too much. We started Canine Good Citizen. I know he won't pass, but I know the training will benefit him. We have had him 2 months. He had to be pulled aside during the first class for his aggression. He was literally walking on 2 feet trying to bite owners and dogs. I got some great advice, baby steps...take him to a park and just work with him on self restraint. I bought a muzzle and am working with him getting used to it. In four consecutive days, he has made NO progress at all. He continues barking and lunging at anyone even if they aren't close. Is there any hope here? I am so discouraged.