Cornell University College of Veterinary Medicine has published guidance encouraging dog owners to re-evaluate what they feed their dogs, a prompt that lands squarely on the checklist of every wellness visit a practitioner conducts.

The message is simple on its face. Diets that suited a dog six months or a year ago may not suit the dog in front of you today. A food chosen for a puppy, an athlete, or a healthy adult can become the wrong food as age, weight, activity, and health status shift.

The full Cornell piece carries the details, but the editorial signal for clinicians and owners alike is clear: the diet conversation belongs at every checkup, not only when something goes wrong.

Why re-evaluate a diet that seems to work?

Because the dog changes even when the bag does not. Life stage is the most obvious driver. A growing puppy, an intact adult, a neutered senior, and a pregnant bitch have different energy and nutrient demands, and a food fixed at one point in life drifts out of alignment with the animal.

Body condition is the other driver. A dog that gains weight on the same ration and the same activity level needs the ration challenged, not merely the food continued. Owners often anchor to the feeding chart on the package, which is a starting point rather than a prescription.

Health events force the question hardest. A new diagnosis of kidney, joint, gastrointestinal, or metabolic disease can convert a maintenance diet into a mismatch. That is the moment a re-evaluation stops being optional.

What should the re-evaluation cover?

Cornell's framing points owners toward a structured review rather than a spontaneous swap. In practice, that review touches the practical questions a veterinarian will ask anyway:

• the dog's current life stage and activity level;
• body weight and body condition trend since the last visit;
• the specific product, formulation, and amount currently fed;
• treats, chews, table food, and supplements that sit outside the main ration;
• any new clinical signs — weight change, GI upset, skin or coat changes, appetite shifts.

That last item matters most. Owners often attribute gradual change to aging when the diet is the variable that moved first.

Where does the veterinarian fit?

Before any food change, the Cornell guidance directs owners toward professional input, and this is the point practitioners should reinforce. A diet swap made without a diagnosis can mask clinical signs, delay workup, or unbalance a ration that was doing its job.

The exam-table version of this advice is straightforward. Ask the diet question in full at every visit — brand, formulation, amount, frequency, treats, supplements — and record it in the record the way you record weight and vaccines. A diet history you can trend is a diagnostic instrument. One you cannot is a gap.

For clients who raise diet questions between visits, the answer is the same: bring the label, the amounts, and the dog, and let the assessment drive the change.

What changes at the exam table?

For companion-animal practice, the practical impact is procedural rather than clinical. Add the diet review to the standard wellness template. Flag life-stage transitions — neutering, senior screening, breed-specific risk windows — as automatic triggers for a ration check. Treat unexplained weight drift as a diet question first, then a disease question, then both at once.

There is no food-animal or regulatory dimension to this guidance; it concerns individually fed dogs, and no product, drug, or agency action is at issue. The story here is preventive nutrition as routine husbandry.

The bottom line

Cornell's guidance reframes the diet as a moving target rather than a settled decision. Dogs age, gain, slow down, and develop conditions; their food should be audited against that reality on a schedule, with a veterinarian in the loop at every step. Owners who take the prompt seriously arrive at their next visit with labels and amounts in hand — and that, for the clinician, makes the re-evaluation half-finished before it begins.