This is what we found out about Poinsettias and other Holiday plants and flowers:
"Though they have a bad rap, poinsettia (Euphorbia pulcherrima) plants are only mildly toxic to cats and dogs. Mild signs of vomiting, drooling, or rarely, diarrhea may be seen. If the milky sap is exposed to skin, dermal irritation (including redness, swelling, and itchiness) may develop. Rarely, eye exposure can result in a mild conjunctivitis (“pink eye” secondary to inflammation). Signs are self-limiting and generally don’t require medical treatment unless severe.
Far more worrisome are holiday bouquets containing lilies, holly or mistletoe. Even bouquets brought into the house by holiday guests should be thoroughly inspected, as lilies are the #1 flower often used by florists. Just one or two bites from a lily can result in severe acute kidney failure in cats – even the pollen is thought to be poisonous! Other yuletide plants such as holly berries, mistletoe, and rosemary can also be toxic to dogs and cats. When Christmas or English holly is ingested, it can result in severe gastrointestinal upset thanks to the spiny leaves and the potentially toxic substances (including saponins, methylxanthines, and cyanogens). If ingested, most dogs and cats lip smack, drool, and head shake excessively due to the mechanical injury from the spiny leaves. As for mistletoe, most of us hang it high enough so it’s out of reach of our dogs and cats – nevertheless, it can also be toxic if ingested. Thankfully, American mistletoe is less toxic than the European varieties of it. Mild signs of gastrointestinal irritation are seen, although if ingested in large amounts, collapse, hypotension, ataxia (walking drunk), seizures and death have also been reported."