C.:
Remember the old adage "It's easier to do it myself?" That seems to be the problem. While it would be easier to jump in and do most of the work, it won't help your son. Instead, how about asking him questions that will help him come up with ideas. For example: What did he learn about Shetland Sheepdogs that seem most important to share with the class? (They are herding dogs from Scotland.) What games do the dogs play? (They are full of energy and like to run, jump and dodge.) What board games do you enjoy that incorporate these games?
Well, you get the idea. Remember to keep asking questions and resist the impulse to "do it yourself."
Good luck.
C.