Birthdays are an undeniable reminder that we are in fact getting older. As much as we might wish we could turn back the clock to our younger days, aging does have a few perks like more wisdom and finding out who your true friends are (they're the ones giving you the best gifts!). I guess it's also not so bad to party and eat as much cake as you can cram in your face!It looks like dogs tackle the same complicated emotions we do when another birthday rolls around. 1. A special day for a special pup. Imgur 2. Drop...