The holiday season brings new visual stimuli to our environments. It also is commonly accompanied by a variety of seasonal smells in diffusors, candles and sprays. Some of these are toxic to pets.
Source: Catnip, November 19, 2020. Link. Common essential oils that could prove toxic in the wrong dose include: Tea tree, citrus, pine, pennyroyal, eucalyptus, peppermint, sweet birch, cinnamon, clove, wintergreen, ylang ylang
Also see: Essential oils can be dangerous for dogs, AHD, March 14, 2016. Link.