We had a 2 year old lab that died of liver disease a couple weeks ago. They couldn't figure out what caused it and it isn't common to labs. But he was a great dog while he was alive. Great with kids and other dogs. They are a lot of work as puppies. They do need a good amount of exercise. We found 20-30 minutes of free running and a mile walk was pretty much required daily. If you can't give him that, he'll be pretty rotten!
We just picked up a new chocolate puppy.