We did some decorating with the dogs in mind. On the very bottom branches of the tree we did not put the breakable ornaments. Our Christmas tree branches are only about 6 inches off of the floor, so that's low enough for them to bump the tree and knock ornaments off. I sure didn't want them possibly getting reprimanded for walking by the tree the we put up.
We were nervous about them "marking" the tree. In years past we caught them doing this. This year we didn't catch either of them and no marks around the tree! We didn't even have to block off the Christmas tree area. I'm not sure why, but my dogs are getting much better about not wetting in the house.