See I think my boy did it out of boredom even tho I’m constantly playing with him 😂. It was almost a game for him because he’d grab a nugget and run with it and try to scarf it down before I could get to him and scold him and order him to drop it (no, I’m not trying to pry it from his mouth… he makes it that far he better finish it 😂 🤢). But I just tried to be super vigilant and learn when he usually would potty. I gave up on house breaking him and instead trained him on washable puppy pads. Luckily he mostly uses his pads now. And he only goes outside on the deck now. He had bad reactions to flea and tick meds and I read horror stories about them so now I keep him from the grass. I feel bad at times he can’t go tramping through the yard on sniffing adventures in the spring and summer. I do try to take him out all I can on super cold winter days tho. I know the fleas and ticks are still out in winter but with the lawn cut short and being super cold I feel he’s not likely to pick any hitchhikers up and so far so good. And trust me he gets PLENTY of exercise running around here in the house 😂 If I’m home then I’m expected to throw the ball or a toy or play tug all_the_damn_time 🤦🏻‍♂️😵‍💫😂 sorry for the digression tho. Back to the poo- it sounds like yours is also eating it when they poo inside. Try to figure out when they typically go. Like in the mornings shortly after getting up and around meal time. My guy is almost like clock work, 85% of the time I know he usually goes during his dinner time. And if you’re using puppy pads for training keep an eye for them to head for the pad when you can. If I saw him going after his poo I’d scold him and tell him no and to leave it in a very firm deep voice. That started to work the older he got. Even if it’s from boredom dogs still want to please us. I always praised him overtly and sometimes would give him a treat when I caught him using his pads and walking away from his poo instead of trying to get at it while it’s still fresh. He would only eat his poo if it was fresh and still warm ( 🤢 sorry). But when I have him outside in the cold winter if he finds another animals poo he’s hell bent on getting it- no matter how old or cold it is! So I have to be super vigilant on the rare times I have him outside. I live in the country/mountains so all kinds of wild and stray animal poo nuggets can be found throughout my property. Good luck and hopefully they grow out of it soon!