'I vant to suck yur blooooddd ruff ruff' or how to assure your dog doesn't feel like a fool all dressed up for Halloween

• Schedule a dress rehearsal and try on all costumes well before the big night. Please don't put your dog or cat in a costume UNLESS you know he or she loves it (yup, a few pets are real hams!). If your pet seems distressed or shows abnormal behavior, consider letting him go au naturale or in a simple, festive bandana.
• Does your pet have sensitive skin? Even those with hearty coats can have allergic reactions to the synthetic materials found in many costumes. While you ride a sugar high, your pet might be uncomfortably scratching the night away.
• If you do dress up your pet, be sure the costume isn't annoying or unsafe, and make absolutely sure it doesn’t limit your pet’s movement, hearing, vision or ability to breathe or bark. Ill-fitting outfits can get twisted on external objects or your pet, which can lead to injury.
• It’s best to avoid costumes with lots of sequins or other dangling parts that your pet could eat or choke on.

source: ASPCA website