I think the poops could be because of the food as well..my older two dogs were on pedigree for a while and had horrible stomach issues from it.
The itching I do think is probably from the corn. I switched my puppy over to Diamond Naturals puppy which does have grains but no corn, wheat, or soy and for her the itching has calmed down considerably. I haven't seen her chew on her paws or body except a little bit when coming in from outside. I think the issue she has with outside is that it's kind of humid but chilly outside and I think that makes her a little itchy. It's not a constant need to itch though, so for us I think grain inclusive but not corn inclusive is working.
The itching I do think is probably from the corn. I switched my puppy over to Diamond Naturals puppy which does have grains but no corn, wheat, or soy and for her the itching has calmed down considerably. I haven't seen her chew on her paws or body except a little bit when coming in from outside. I think the issue she has with outside is that it's kind of humid but chilly outside and I think that makes her a little itchy. It's not a constant need to itch though, so for us I think grain inclusive but not corn inclusive is working.