You dog is still a puppy so any ailments is a cause for concern. Food transitions take a week maximum, not a month. Purina bought Merrick in 2015, so by now per reviews, it isn’t the same quality anymore. Excessive poop means zero digestion, she’s not getting any nutrients from the food. She shouldn’t be vomiting at all, and if the raisins aren’t in the vomit, stop the kibble immediately & take her to the vet. Both causes severe dehydration. Run fecal tests if you can. Feed Zignature Zssentials until you know what’s going on with her GI tract.
