How do I keep my dogs away from the Christmas decorations?

I have two dogs, Bella 3yrs Dalmation mix, and Daisy 7mths Dodson mix. Daisy is new to our family and this is her first Christmas. How do we keep the dogs away from the Christmas tree and the ornaments. Bella is used to seeing them, and can stay away from them by herself, but now that we have Daisy, Bella follows what Daisy does. Help! |||get a baby gate and put it around the tree|||i buy a type of finger nail fluid to make them stop licken it its ment for humans to stop chewing there nails but its works on dogs to