https://phys.org/news/2018-10-halloween-pets-veterinarian.html

Nelson said one of the most important things to do is to keep all candy—whether for trick-or-treaters or yourself—where pets can't get to it.

"Chocolates, sugar-free candies and gums, raisins and some nuts can be toxic to pets," Nelson said. "Candy wrappers and lollipop sticks can also become choking hazards or gastrointestinal foreign bodies if ingested."