Mocha had loose stool while on BB so I switched him to Orijen and problem went away. However, I was speaking to a BB rep at a pet fair and she said they have this formula called "Blue Basics" that will not cause loose stool. If you want to stay with BB, give the Basics a try. The rep did caution me about Wilderness, saying that only very active dogs should be on that. If your baby does not exercise everyday, stay away from Wilderness. She tole me Mocha is fine since he runs with me every other day. Hope this gives you a good reference point to decide whether to stay with Wilderness.
If you want to give Orijen a try, this video tells you everything you need to know about the food.
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Oops...just realized that you said "Wellness", not "Wilderness"...sorry, please ignore my post.