Everyone loves to claim that their teams’ mascots are the best on the planet. It's human nature. You love your mascot. Your mascot is a part of you and your school/team/life.
But these mascots really are the greatest.
Just like everybody loves to argue that their mascots are the best, people love to say that their dogs are the cutest. Therefore, it stands to reason that fans of these institutions would fight to the death to prove that their real-life doggy mascots are the best, the brightest and the most adorable in the universe.
Let's just call it a draw. They're all pretty cute.