Certain types of yuletide plants (e.g., mistletoe, rosemary, holly berries, etc.) can be toxic to pets. Varieties of English, Japanese, and Chinese Holly contain toxic saponins. read more
Holly is toxic to dogs, reports the U.S. Food and Drug Administration. Yes, it is a lovely decoration in the garden and in the home, but certain chemicals in holly, called ilicin, saponins, and methylxanthines, make both the leaves and the berries toxic to dogs. read more