My dogs as well as the dogs I walk like Christmas trees.  I'm not sure what the fascination is about Christmas trees laying on the side of the street waiting for trash collection but all dogs want to smell them.  The boy dogs want to pee on them too.  I always wonder if I should let dogs pee on them.... I feel badly for the guy that has to pick the tree up  to throw it away. The first Christmas I had Sam (Christmas 2001) I bought a real tree.  I'd never had a boy dog before.  I set the tree up in the house, Sam walked over, sniffed it, and lifted his leg.  I had to laugh (and I still do when I think about it.)  That was probably one of Sam's best days: a tree just for him INSIDE the house.  How awesome!! :)