Thanks everyone. Sorry for the late reply but I kind of got busy and forgot about this thread! So much great advice. Some is along the lines of what we are doing, some is new.
I still run with diesel as much as possible but it never tires him out for long. He is a machine. I grew up with two German Shepherds, two Rottweilers and a Rotty/Bernese mountain dog X, who combined probably didn't have as much energy as this guy! I grew up on 200 acres though so the dogs had a lot of freedom
He is still relatively good at home but continues to have issues with socialization. I have to be honest too, I take him out much less now during the daytime or where there are a lot of other dogs simply because I can't handle the way he acts. I know this is really wrong but for the past few weeks I just can't deal with his whining and barking when he sees another dog.
He is starting a dog daycare twice a week on monday. So he goes in for 8-9 hours a day. The dogs are all in a nice big area together with lots of toys, a cool little playground and half of it is outside, so fresh air. They seem to take great care of the dogs and allow big and small dogs which I like. I didn't want him going to a small dog daycare which actually may not allow him anyways because I am hoping some of the older, big dogs can put him in his place.
We'll see how that goes.
I forgot to mention something funny. Today I was walking him past the big Vancouver Police Station near my place and there was a huge group of officers outside. Well Diesel decided he would bark as loud as he could at them! So embarrassing! They were cool though and just kind of asked if I wanted them to arrest Diesel and take him away. I said sure but I guess they didn't realize I was serious.