So what did you start feeding your guy? I may look into this test because I have a 12 week old puppy with severe diarrhea and the vet thinks it's a food allergy. However the Dog food they said we could buy is $80 a bag!
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So sorry your puppy has had a rough start. I'll assume that your vet has thoroughly checked out the possibility of parasites (especially giardia) with fecal tests.
I certainly wouldn't start buying $80 bags of dog food for a puppy with undiagnosed diarrhea. Is he on medication now and being fed a bland diet for a few days?
The test may be worth it for you. I haven't done it, but I have a lab with a chicken intolerance that I discovered through trial and error. Bentley doesn't do well with barley, flax seed, etc. If you decide to do the test, in the meantime you may want to be feeding a simple, non-chicken kibble.