Stagnant tree water can be breeding grounds for bacteria, which can also lead to vomiting, nausea, and diarrhea, if ingested. Electric cords - Avoid pet exposure to electric cords. If they were chewed, they could electrocute your cat. Cover up or hide electric cords, never let your cat chew on them. Ribbons or tinsel can get caught up in the intestines and cause intestinal obstruction.
Batteries contain corrosives.
If ingested they can cause ulceration to the mouth, tongue, and the rest of the gastrointestinal tract. Glass ornaments can cut the tissues of the gastrointestinal tract if ingested. Remind holiday guests to store their medications safely as well. Pain killers, cold medicines, anti-cancer, drugs, antidepressants, vitamins, and diet pills are common examples of human medication that could be potentially lethal even in small dosages. During the holidays, many veterinary clinics have limited office hours.