OH! This is VERY, VERY important!
This is seriously important.
I have found that if a dog does not learn how to play fetch when it is young, It just won't. I had a stray golden retriever -a RETRIEVER- that we got around the age of two. He would not touch a tennis ball. My other dog lives to play fetch. It keeps us all exercising.
Some dogs play some don't, but I think the earlier you give him a ball and play with him, tug and toss, then the better off he'll be and the longer he'll live.
Please have Steven teach him how to fetch.
I need a dog to tell me, 'Stop what you are doing and come play with me.'
I get tunnel vision and try to work until it is done, but nothing is ever done.
And again, if this was meant to be your dog and not mine, that is fine. I understand. He just needs a good home.