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Other tree decorations that can be hazardous to pets (and children, for that matter) include angel hair -- a spun glass or pvc decoration, garland, lit candles, mistletoe, poinsettia plants, and holly berries. Decorations that are not a part of tree trimming, but that are also worth mentioning are advent calendars, in which candy is placed in the small numbered cubbies; and liquid potpourri, which can be spilled or ingested.
It is safest to stick to artificial plants and plastic or unbreakable ornaments, just to be on the safe side. When you can rest in the knowledge that you have done everything to make sure your pet cannot be harmed, then everyone can share in a happy, healthy holiday season together.