The reason we can't have a Christmas tree or any other live plants

So many of you are posting photos of your beautifully decorated tree's. You have purchased them, set them up, bought decorations, and have posted photos all over the internet of your beautifully decorated homes.
I have seen your trees all lit up at night in the window, twinkling with lights and a star a top.
That must be nice.

Unfortunately, we don't have that luxury. It has nothing to do with money, time, or principal.

It has to do with him.

We have 2 border collies, and these are some of the smartest dogs in the world. They are the perfect dogs for us. They are active, and fit our lifestyle. I take them running, we take them hiking, or to the lake.  In addition to intelligence, they are incredibly well behaved. It took less than a week to house train them, and I can count on one hand how many times they have torn something up or messed in the house. 

But this one, our youngest dog, Bear has one major flaw. He will urinate on any living plant. He has killed many a bush outside, and all of our pots that we plant flowers in are discolored because he will urinate on them so often. It is the one habit we cannot break him of. P calls it his acid piss, because this stuff is deadly.

We are scared to bring a tree into our home because he know that while we are gone, he will destroy that tree, and spend all day urinating on. 

What about you? Do you have a tree up, or are your pets keeping you from bringing a tree home too?