While Catholicgauze wishes everyone a happy, safe night of harmless and healthy fun, the international backlash against the American holiday of Halloween is now being fought not by the French who gave up and now are co-opted but by the British, the semi-official newspaper of the Holy See, and Russia.
The old Catholic tradition for Halloween was/is to dress up as one's favorite saint. For those who want to combine old and new or just be really retro then they should consider dressing up as Saint Christopher for Halloween.
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The legend of dog heads was adopted into the Christian cosmological world view. Even in the age of Marco Polo many Christians thought the ungospelized world was filled with quasi-humans with faces on their backs, dog heads, and other weird traits.
Today Saint Christopher's existence is disputed and the Catholic Church is playing it safe with toning down but not stopping the cult of Saint Christopher.
Or, one can go as the badass Saint Michael the Archangel