Don't share Halloween candy with your pets. Chocolate is toxic to dogs and cats, and other candy could damage their teeth and overall health. Make sure when the kids come back from trick-or-treating, they put their stash out of paws' reach.
Keep your pets a safe distance from trick-or-treaters. Having a steady stream of strangers on their turf might make pets anxious and unpredictable.
As you open and close the door to dish out candy, keep an eye on your dog or cat - pets can easily slip away and end up lost.
If you put a costume on your pet, make sure that nothing about the costume could interfere with his breathing or ability to see. Also, make sure that no parts of the costume could tangle or choke him. And keep on eye on him the whole time - never leave an outfitted pet alone.
If you take your dog trick-or-treating with you, make sure that he is on a leash and has the proper ID tags on his collar. You don't want to have to go looking for him, but if he does get lost, tags with your name and phone number make it much more likely that you'll get him back.
If you have a black cat, or even a dark gray one, keep close tabs on him during the days and weeks leading up to Halloween. If possible, keep him indoors to prevent him from being the victim of any pranks.