Many pets are attracted to the smell and taste of chocolate.
Chocolate can cause vomiting, diarrhea, and other ailments.
Be careful with tinsel. Although tinsel is very pretty and is a common decoration on trees, your pet may swallow it. This can cause an intestinal blockage which could cause your pet an unwanted trip to the vet. Think about using other types of decorations on your tree instead. Be aware of pets and guests.