The wetness Under the dish is from tilting the dish one way or another when they get under it. I use the plastic dog dishes and mine hide underneath them as well. I get the same thing. They will go under the hides but you'd notice. It's totally normal to hold poops but if it goes
Into the month stage I usually give a soak In the bath. Water temp 88.f. Dehydration usually leads to constipation. And a good soak may just activate things.