I know this sounds crazy (like we're over-acting)...

But when that happens here, as we're picking up the paper, we focus directly on the place which was soiled (leaving the dog to the side and not directly connected to the activity)
We have "boo-hooed" (sorta sobbed out loud) with some "Ohhh me what happened here"'s, where it can see we're upset with what happened.

HA, it works...

Have a good Day !
S.W.