I always forget about sprouts. I don't know why, because they're such an obvious choice for springtime. Sprouts are the epitome of Spring.
Is your dog eating lots of grass? How 'bout offering sprouts?
I bought Red Clover sprouts the other day, but you could use alfalfa, or if your dog like greens even the big sunflower sprouts. Don't get onion sprouts. Radish... would depend on your dog. Wheatgrass is good too.
Sprouts, weak-walled baby plants that they are, are easier for dogs to digest compared to adult plants.
And of course you can eat them too! It's always cool to share food with your dog.