My pooch wears the Cabela's Ripstop Chest Protector and it does a great job.
http://www.cabelas.com/cabelas/en/te...set=ISO-8859-1
I bought a "Mother" brand vest this year and it is the frickin' bomb. Tons of room for shells, birds, lunch, water bottle for you, clips for your transmitter...and you can add the hydration bottle for the dog or yourself. Awesome.
http://www.mothertech.net/products_hunting.html