
Hi Guest,
It sounds as if your dog is nearing the end of the adolescent phase - which usually lasts from when the dog is about 10 months to about 18 months. They can be a complete nightmare at this time! What generally happens is that, if they were reasonably well-behaved before this time, they will get back to being reasonably well-behaved afterwards, especially if you just carry on with the training practice. My boys were just the same, but now will make a bee-line for the rabbitholes they know, and then come back to me when they have finished checking them out!
In the meantime, to give him extra exercise, are the roads quiet enough in your area for you to take him out with a bike? Don't go for too long or too fast - keeping him beside you at a trot will be fine to use up some of his energy.
Why not register with this site and then you can put more questions?
Hope this helps. :)