I would suggest picking him up and putting him on the pad. If he's got to go bad enough he'll go on the pad and when you put him there I would say a word associated with going to the bathroom that you want him to learn and then keep him there until he goes, if possible. When training Winnie, if we caught her in the act we would say "no" and pick her up and put her outside until she finished and if she didn't go to the bathroom outside then she went in her kennel. I'm not an expert but I agree with the above, it will be a bad habit if you don't correct it now.
As for eating poo, I have not experienced that. EWWW.
Good luck! |