In truth, poinsettias are generally not poisonous, although too much may cause stomach upset. Holly and mistletoe are toxic, particularly the berries. Also keep glass ornaments up high, away from curious paws. Of course, placing a candle on a table may not prevent a curious cat from knocking it over. Aside from a real fire hazard, pets may singe their fur or feathers.
Dripping wax can also burn paws.