New to board and Doodles

I have a wonderful little dog that I rescued from a co-worker of mine back in '03. At the time he told me that he paid a ton of money for this dog and it was called a labradoodle. Well, never having owned anything other than a mutt I paid him no mind. Well then I saw a news feature on designer dogs and there was a dog similar to my Stumpy. Anyway since then I have done some studying on Doodles and I do believe my dog is a doodle.

Anyway my question is....does anyone know how I would go about finding out where my dog came from? I know it's next to impossible, but any suggestions would be great.

Thanks
Randi