Perhaps a rooster silhouette perched atop the dog would be appropriate? At the very least you can add a chicken themed weather vane to the peak! Love the re-purposed dog kennel as a chicken coop BTW! Looks like it works well.

Sorry no go this was our GS Dog Condo before it was a chicken coop. It remembrance of Yukon who kept all in our house safe we keep up the GS silhouette. For 17 years he was our watch dog and best friend.