When a dog goes off their food it is tempting to change everything at once — new food, toppers, hand-feeding. This check does the opposite: it narrows things down to one starting point, so you can tell whether it actually helped.
Warning signs are screened first: if you report things like repeated vomiting, low energy, or a dog that has not eaten at all for over 24 hours, the check stops and points you to a veterinarian instead of giving feeding advice. This is not a diagnosis, and it does not identify a medical cause — it suggests one reasonable, non-medical place to begin.