15month old male German shepherd

Very clever, obedient German shepherd for sale, 15 months onld. He has a great treat drive and is easily trained. He currently attends weekly training classes at seaburn sunderland and is in the advanced class. He loves his walks and plays fetchHe walks well on the lead and has good recall. Would make a great companion and loyal family pet. Great with children. He is so loving and loves to cuddle. A change of circumstances has meant a reluctant sale. £500 o.n.o. Good homes only, and please no time wasters as this is difficult for me to rehome him.
he is good with my dog and families dogs, but still a bit nervous around strange dogs and will bark and be vocal as he was attacked in my local park when he was playing off lead, which in turn has frightened him, so all the hard work destroyed. But he goes to training class weekly with 16 other dogs and trains well off leash in class, and he is not deterred by all the other dogs he is focused on me. He is still young and loves training and has a great drive for it, especially with food as a treat. He is very loyal and won't leave my side. He has great recall when I have him off leash on my field in the estate. Trying to slowly build his confidence back up in the local park on a long line. He is an amazing dog but sadly my iv had a diagnosis that is affecting my balance and mobility. I have another 4yr old shepherd and I can not manage both of them.