aw thats too bad, but def sounds like you made the right decision. and it was really nice of the trainer to give you a credit! exposing him to new environments and getting more socialization is wonderful, that should definitely help him. its never too late to go to classes, and you can always work on training at home. when my dogs are going crazy and embarassing me in public lol I just remind myself that like us, no dog is perfect, they all have different strengths and weaknesses, but we love them anyway. he has a great home with you, is safe and loved, and thats what is important. good luck with everything!