I think it was the same dog, but I do remember a shorthaired marble-colored dog. I didn't see much of it, just the head once in a while popping up from behind the fence. I remember you having a wire across the top of the fence (even though I seem to remember the fence being fairly high, but we were kids back then so it may have just *seemed* big) so that the dog wouldn't jump over the fence and run away. So when someone entered the yard and the dog wanted to see what was going on he would jump up in the air to see over the fence. You'd look at the fence and just see this dog head popup and then go away like a whack-a-mole or something. I remember that sometimes the dog would get a running start and jump, so you'd see the head pop up over the top of the fence in an arcing motion. That dog was hysterical, but those are my only real memories of him. It was so long ago. I assume it's the same dog that you are talking about, but I thought we might have been around 5th or 6th grade or something. Like I said, it was a long time ago, so the memory is a bit fuzzy.
I felt the same way about my dalmation (remember her?). She ended up living about 14 years. Not too bad for a pure bred!