What's the nicest way to tell someone...

That they need to take their dog outside to poop & also Try and best avoid Having them poop in the room , we got home from coming out of town and the whole Aparment smells like straight dog shit . its My SO Co worker and his wife that stay with us , I am sorry I love dogs and all but I just cant stand the horrible smell & it smells like wet dog ! We never had this issue before with no pets....

I wasn't with it Them moving in with a dog , I just cant.... How can I tell this girl with out her taking it the wrong way .

Cause ive confronted her about other situations and she took it up the ass telling me well I'm sorry , sorry if you don't want to be friends anymore and its like whoa I was just telling you to chill out with blowing my SO phone up if he dont answer when you had a question to ask For your SO ( he doesn't have a phone )

* I mopped the Living room and all , but what the problem is now , the room is whats giving off this horrible odor ....

I do plan for sure talking to her , the smell is coming to our room...