Don't let your pets eat too many treats in their stocking all at once.
Ribbons, tinsel and string are bad for cats, mine find rubber bands hair ties etc a fascination also.
Poinsettia leaves can cause diarrhea and vomiting in cats, if leaves have been ingested take away food and water for a few hours and pass the poinsettia on to a non-pet household.
Watch what you have dangling on your tree. Cats love dangles. It is a game to them but not to you if that precious heirloom ornament comes crashing down..
Mistletoe is good for kissing under but the toxins lectins and phoratoxins can cause low blood pressure and a slowed heart rate for pets. fortunately a large amount will cause these symptoms and also vomiting, diarrhea and difficulty breathing. No one will feel like kissing after that!
Holly berries can cause vomiting, diarrhea, loss of appetite and decreased activity in pets.
Xylitol found in candy, gum, baking goods can also be a problem causing low blood sugar and liver failure in dogs.
Dispose of bones properly, especially the smaller sharper ones. Dogs like to explore your trash can.
Many of these recommendations can be found in detail on the fda.gov's website.