Okay, I have a great snack!
I get Chicken Breathies by Dogswell - BUT, I get the Catswell version, because each treat is much smaller, and the package fits right in your purse. It's great for treating your dog outside, if you are teaching him to Heel, or Come, or Sit at crosswalks. I buy them in ten packs off Amazon.
I also use Old West Bah-B-Qs, which are dehydrated lamb lung. These are nice and soft and can be broken into small pieces for small dogs.
I feed a lower protein food (Halo), and then Thor gets almost all-meat snacks. It seems to work out, poop-wise.
BTW, Thor is super-picky, even about treats, and didn't like Zuke's much. Too healthy, maybe.