Our Yorkie is trained to go toilet outside or inside on a newspaper (well, she is 90% trained).
But when she makes a mistake indoors she picks up her poop and carries it to her bed, where she chews it up.
We suspect she is trying to 'hide' her misdemeanour!
Obviously even our mildest comments are making her feel guilty.
I am not sure how to get her out of this habit, but for starters we will never again comment when she poops in the house.
A few weeks ago I told her that if she doesn't try harder with the toileting thing I was going to buy dolly diapers for her to wear.
Mmmmmmmmm!! Perhaps that explains a lot!