So my family got a lab boy puppy at about 5 weeks old from someone giving away the puppies. (I learned now that they shouldn't have given him away until 8 weeks). He's 6 months old now, and still refuses to poop outside. He will pee outside ever so often, but mostly in the house, on towels, because he chews up puppy pads. He also poops on towels too. He gets taken on plenty of walks, but still isn't getting the hang of it. Any advice?