We get together with friends every Sat for gourmet night and have a blast. Here's the thing... they bought a tiny "chiweenie" mix puppy in Dec and she and our Grady (now 9 months) love each other and play the whole time. BUT, she isn't the best house trained puppy and Grady is doing great and never has accidents but has started to mark. So I have caught HER peeing in the house while we are cooking, goofing off and then inevitably... Grady finds the spot and marks it with his big ole mastiff pee. It's only happened twice now but I'm wondering how to approach the topic. I know it's our problem that Grady is marking where the female pup is peeing... but I think I'm going to have to ask them not to bring her over if she keeps peeing in my house. It's brand new carpet to boot and I hate that it's going to be ruined much faster if this keeps up. Any ideas? I love the tiny wonder (she's 4lbs) and it's great for Grady to be around other dogs, especially tiny ones so he knows to be gentle. I don't want to offend our friends. Thanks for any advice!!! Am I being to uptight??? Their puppy is 7 months.