What treats are you using?
Sometimes you have to take out the big guns even in low distraction situations- to get him to work with you.. Such as real meat, cheese, freeze dried liver meat.
For a crate i suggest a plastic crate
, they are not as easy to escape from, some dogs prefer them over wire crates. Since you have such a big dog go for giant or XXL sized crates.. they do make them for huge sized dogs! http://www.amazon.com/Petmate-Kennel-90-125-Pounds-Bleached/dp/B00149FL00/ref=sr_1_17?ie=UTF8&qid=1389139351&sr=8-17&keywords=XXL+crateHere is a wire cage link: http://www.amazon.com/MidWest-Solutions-Door-Large-Crate/dp/B0012GOEGW/ref=sr_1_1?ie=UTF8&qid=1389139338&sr=8-1&keywords=XXL+crate
Before offering attention, food, water, going outside, treats, going out of a bedroom. Ask him to do something for you
such as sit and wait, down, shake, etc. This is helped a bit for my very rude girl
As for exercise
, if he has good hips and elbows and can run (what a blessing that is!) Take him out and give him a nice good run with chuck it! Also do walks, as they can be fun for you and him and a bonding time. But if he can RUN, let the guy run to get his energy out that way!
Try incorporating fun tricks
and add a new one every week or every 3 weeks, whatever you can do. This is fun for both you. Continue to do the commands he knows now, but do them throughout the day, on walks, before getting up, etc.
Mind games are very important for your dog, just as exercise
. There are actually books out there with lots of different mind games you can do with or without your dog, such as this book, which i recommend! http://www.amazon.com/Brain-Games-Dogs-Provide-Stimulation/dp/1554074908/ref=sr_1_2?ie=UTF8&qid=1389140037&sr=8-2&keywords=mind+games+for+dogs
Just some of my thoughts!