10 weeks is still very young. Has he been checked for worms?
I would not give very many cookies or peanut butter at this age. He needs to grow with a good puppy diet.
As you have discovered, try to give only durable toys like a Nylabone or Kong if you are not around to supervise.
I'm thinking he needs another vet check and poo analysis. Good Luck
Please have pets spayed and neutered,
and wearing a collar with an ID tag.