First of all, sorry about the quality, but these were the only pics I could find of him. My scanner
is horrible, hence the lines across the pics...
Anyways, this is my childhood dog- the first pet I had. His name was Shack. He had to be put down at the age of 12 due to severe HD (He'd had two surgeries on his left hip). He was a wonderful dog, great around children. He was highly protective of his yard, yet terrified of thunder storms. He loved to play with our lab in the water and it was hard to keep him away from it.
As for breed, his mom was my mom's co-workers dog, and she was a purebred. I think that breed is very obvious in him, but the dad was unknown. We have a pretty good guess, but I wanted to see if everyone else agreed with me. He was about 75 lbs. These are at various stages of his life.
(note the squirrel)
I think he was a puppy here.
That's all! Happy guessing!