Got a group of friends over tomorrow for wine night and dinner. My friend has a lovely dog but it's a bit chaotic (springer spaniel) and last time weed all over our carpet. We've just done a renovation and everything is brand new. She's asked if she can bring the dog as no one's can have her but we also have a Mini Doxie who's quite protective and I just don't want the mess or the stress from it all. How do I politely say no, I have a feeling she will likely cancel if I say no too...