I've always had live trees with all my pets. The cats seem to like to sleep under the tree and when kittens try to climb it. They all learned eventually they couldn't climb it. As for puppies, I only let a pup have access to the room with the tree when I'm in the room. After they have become adults I've had no problems with male or female dogs. I do make it a practice not to put any edible presents under the tree prior to Christmas morning though to avoid any smelling temptations.
Snake Vom Eselspfad RN CGC (AKA Raina) 3/5/08
Pyrate CGC 4/1/03-5/16/12 RIP
Too many to list waiting at the bridge but remembering them all