I don't exactly understand from your description what the problem is with your dog. But in-board training, meaning the trainer boards the dog for a month or two being the duration of the training, is common and in some situations beneficial to the training of the dog. If you were to say that you just wanted basic obedience training I'd say you're better off working with your own dog under the instruction of the trainer. If the dog has some nervous issues with certain situations it may be better if the trainer take the dog as the work is very precise.