RE: shed dog question!
I'm getting a pup soon, and want to train her to shed hunt.
My buddy, who has trained a lot of dogs, says to hide the shed and let her find it. May be your next step beyond playing fetch with a shed.
He also says to work with a dog for 5 to 10 minutes max. After that the pup looses interest and you both get frustrated.
One more thing, he also says to stick with just one thing for the dog to retrive (shed, toy, dummy). Switching only confuses the dog. Plus keep family interaction free from training time.