Oh bummer! Mine will do the same thing on occasion. I'm not sure what the stimulus is for them to be outside for half an hour, then come inside and promptly (well, as soon as I'm not watching) poop in the house! At first I thought it was b/c it was too hot outside, then b/c the grass was wet, or it was too windy or it was too cold.....
. And it's only once in a great while...although, Madison is prone to going inside in the middle of the night
. They're actually PRETTY good though. I mean, if they HAVE to go and you're asleep, I figure it's MY fault, not theirs.
I used to be able to tell the difference between the two b/c Madison had such an "issue" with his gut ...but now that he's so much better and on the same food as Max (for the most part), it's almost impossible to tell the difference. Actually, I'd rather have it that way than the other way
.
I know it's frustrating when one does it and kind of "teaches" the other one to do it too....luckily, I nipped the marking thing in the bud when I saw Max lift his leg in the house...he knows better! Good luck; I don't know what you do; I just try to watch them closely (which I know you do) and keep opening the door up for them to go out. Poo DNA
would be great, but the problem is, that once they've done it, how can you reprimand them for it unless you saw them do it? I'm sure it would be out of body, out of mind, LOL.