Could be portioning. If they're eating too fast/too much, feed in smaller, more frequent meals.
Is the puppy's stool normal? For a while we were using peanut butter in our first dog's Kong bone, and it turns out the peanut butter we were using had a salmonella recall we weren't aware of for a long time. Have you checked for recalls on the products you're giving them?
Stool looks good. I haven't checked on recalls.
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If the recalls check out I would stick with the portioning idea @grayruby suggested.
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Thank you.
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