I lost my GSD/lab/??? mix a few days ago. I had her since I was 6, so I was pretty close to her.
She was a pretty strange dog; she never really enjoyed toys or fetch, and she always chose to bury what she did play with in-between the cushions of the couch, but she was really fun.
All throughout her life she was extremely hyper. Even at 10 she acted like a complete puppy.
She was 10 years old. She died suddenly, so we don't really know what happened, but she never had any major health problems in her lifetime. We adopted her from the SPCA where she had been abused by her previous owner, and had a fear of adult men because of it.
(I'm not sure if my images are a correct size, so I'm just posting the links. Heh.)