Corn snake. Harmless.
A few years back, my wife & I found a pile of poop with something white on it in the living room. Kinda like a dollop of cream cheese on a pile of spinach.
We have three dogs living in the house, so we just chalked it up to one of them being a "bad dog," yelled at them a little, cleaned it up and forgot about it.
About two months later we found the same thing. Actually, "we" didn't find it--the dogs did. All three of them gathered around, sniffing and not one of them acted guilty when we yelled at them.
So I did a little research--which involved looking at far more pictures of various animal poop than I care to recall. At the end of my study session, I got in the truck, drove over to Danny Copeland's and bought a box of shot shells in .22 cal. I came home and loaded them into an old Ruger Bearcat my father gave me when I was about 12 years old.
That night I drank a cup of coffee, went to bed and stayed awake all night waiting.
Around 1:30 in the morning I heard one of the dogs start that low growl they do when they see something they don't like. A minute later another dog started in.
I got up, grabbed the gun and went out into the living room. Right in the middle of the floor--coiled up with one of the dogs facing him down (who got brave enough to start barking once he saw I had his back)--was a snake about three feet long.
As soon as I came into the room he headed for the couch. I could not make out the species but I figured I'd rather not have him living in the couch with us for another month, so I took the shot.
Turned out to be a corn snake. Harmless. I felt bad about it, but I really didn't want him in the house with us (plus my wife about had a cow when she found out...actually, that would have been TWO cows, because being woke up by a gunshot in the living room in the middle of the night didn't make her too happy).
We did get the floor repaired. The dogs (and we) sleep much better now.