As we stock up on beer and nachos for football's biggest day of the year, canine fans are also getting ready for game day. So before we watch the San Francisco 49ers take on the Baltimore Ravens this Sunday, we're getting in the spirit by checking out the biggest puppy pigskin fans on Instagram in their NFL best. Just like everyone's favorite puppy event, the Puppy Bowl, Instagram is filled with playful pooches ready to score a touchdown. Whether they're rooting for Jim or John, one thing's for sure: these dogs have major team spirit. Click on and get ready to say Harb-aww!