Snoopy (Peanuts)

You think picking the greatest fictional pet is easy? Pfft. Enter Snoopy, the beagle who's not just a pet but a full-blown cultural icon. This dog has his own novel, sorta flies a plane, and throws better parties than most people. Fans obsess over every little quirk—from his doghouse decor to his Joe Cool alter ego. It's like, can your pet even claim to be a World War I flying ace? Didn’t think so. It's always a riot trying to defend his unmatched legacy in every spirited debate!