DOG TREAT FAVOR BAGS
Your guests as well as their four legged friends at home will adore this idea!  Anyone who has a fur baby who wasn't welcome at the party is sure to stop at your station and appreciate the fun and practical gesture.  They get the joy of greeting their pet with a little snack when they arrive back home, and you get the pat on the back for choosing eco friendly & consumable wedding favors.
 
Designer's tip: Create a mini snack bar for your guests to package up a few fun dog treats displayed in simple and modern pet food bowls.  Stagger the bowls on various wooden crates, or upcycled boxes under a simple black table covering.  Accent with a few chew toys or doggie accessories & display the printed favor bags in a frisbee or toy basket.