Some dogs love costumes. Many tolerate them for one photo and then melt down. A bandana is the compromise.
Easy festive
Tie a bandana or scarf loosely, two fingers under the knot. Orange, black, plaid, whatever is clean.
Safety
No dangling pieces near the mouth. Skip masks and tight neckwear. Watch for overheating if they have a fur coat already.
Walk night
Short loop, visible leash gear if it is dark, candy on high counters when you get home. Festive does not have to mean miserable.
Photo: Wikimedia Commons, Beagle_wearing_a_bandana.jpg. Beautifully Chaotic Life does not claim ownership of this image.