Leo is now 10 months old. He is 90% potty trained. We take him out to potty or he uses his pee pad indoors. Every so often he poops on his pee pad and like a ninja will carry some of the poop to the sofa when no one is looking. This sofa is in the room where his xpen/crate/pee pads are. Thank goodness he never travels with poop elsewhere. Most of the time when he poops on the pee pad, he comes right to one of us as a signal that he had just peed or pooped on the pad or he just leaves the poop alone.
After transporting his poop, he comes to us with a look of I did something wrong. I'm not sure why he does this or how to stop him from repeating this behavior. He seems to know it's wrong.
First of all, FOR SURE, no matter what it looks like to you, he is NOT saying he knows he did something wrong. He just knows he's going to get a response that worries him from you.
Second, are you SURE he's carrying it in his mouth and not stuck to his butt? My dogs ALL get frantic if poop gets stuck to their hair, and try their darnedest to get it off. I can imagine something getting stuck, and then him running to the couch to sit down and getting it off there. I can also imagine him coming to you with a worried expression after this (in his mind) "horrible" event. If you haven't SEEN him carrying it may from the pee pad in his mouth, I think this is a much more likely scenario.
If you HAVE seen him picking it up off the pee pad with his mouth, you need to watch closer, and interrupt that behavior. With mine, I always made a HUGE deal of pooping in the litter box, then (talking to them all the time) I'd get some kleenex, and we'd go together to flush it down the toilet, and then get a cookie, all the time telling them how wonderful they are. All three of them now rush to me smiling if they poop in the litter box, knowing the whole routine, they wag their tails happily all the way to the toilet with me, then back into the kitchen (right next door) to get their cookie.