Keep your cats or dogs inside for the night if you don't already do it. As much as your dog or cat may beg for some of your Halloween candy, always remember that chocolate is deadly to them in any amount. If you work in a pet store, remember that this is the time of year that can be deadly for black cats. The wrappers, such as tin foil, can get stuck in your pets digestive tract and make them ill or cause death. There are plenty of recipes for making home made dog and cat treats, you can always make them on a Halloween note.
Dogs can have lethal tails, wagging all over the place.
Not only could your pet start a fire but they could severely burn themselves in the process. If you are going to dress your pet in a costume, keep in mind that unless the dog or cat is extremely receptive to this kind of thing, you could be causing it discomfort and stress. Some animals don't mind at all but others do not want to be bothered with this kind of thing. If you put a mask of some type on your animal, make sure that the eye holes are big enough for them to see peripherally. Animals depend on their vision to let them know what's going on and even the nicest dog can get snippy if he can't see what's around him.