If you have spent any time at a conformation show, you have seen the statistic: nineteen of the last twenty Westminster Best in Show winners were fed Purina Pro Plan. In 2026, all seven group winners ate it.
Those numbers are accurate. What they mean is a different question, and it is the first thing anyone entering this sport should understand.
Short answer: the Westminster statistic is real and it measures sponsorship, not nutrition. Purina has been the exclusive pet food sponsor of the major US shows since 2012 and runs a program aimed at breeders and handlers. Judge any food by the company behind it instead: qualified nutritionists on staff, AAFCO feeding trials rather than formulation alone, published research, and a clear answer on calories per cup. Pro Plan clears those bars. So do several others.
The Best in Show statistic is a sponsorship story, not a nutrition study
Purina Pro Plan has been the exclusive pet food sponsor of the Westminster Kennel Club Dog Show since 2012: a five-year agreement, followed by a ten-year deal signed in 2017. It sponsors the National Dog Show and the AKC National Championship as well.
Purina also runs Pro Club, a program aimed specifically at breeders and handlers. Purina’s own promotional claims about Best in Show winners carry an asterisk referencing handlers.
So when nineteen of twenty champions eat the same food, the honest reading is that the brand with exclusive access to the sport, and a sponsorship pipeline into the handler community, is the brand those dogs eat. It is a marketing achievement, and a real one. It is not evidence that the food caused the wins.
No study has ever shown that one commercial diet improves placement in a conformation ring. There is no such study, from any brand.
That does not make it a bad food, and this is where most critics overreach
Having said all that, Pro Plan holds up well against the criteria veterinary nutritionists actually use.
The World Small Animal Veterinary Association’s guidelines on selecting pet foods do not evaluate ingredients. They evaluate the company: does it employ board-certified veterinary nutritionists, does it run feeding trials, does it have quality control across manufacturing, does it publish peer-reviewed research?
Large established manufacturers with in-house nutritionists and research programs clear those bars comfortably. Many trendy boutique brands do not.
So the reasonable position on Pro Plan sits between the two loudest camps: it is a well-manufactured, well-researched food from a company with genuine nutritional expertise, and the show-ring statistic tells you about sponsorship rather than performance. Both are true.
The label sentence that tells you more than the ingredient list
Turn any bag over and find the nutritional adequacy statement. It reads one of two ways.
Formulated to meet the AAFCO nutrient profiles for… means the recipe was calculated to hit the required nutrient levels.
Animal feeding tests using AAFCO procedures substantiate that… means dogs actually ate this food and were monitored.
The second is a higher bar, and it costs the manufacturer considerably more. Most brands do not do it.
Also check the life stage named in that sentence: growth, maintenance, or all life stages. A performance formula labeled for all life stages is legal to feed a puppy; one labeled for adult maintenance is not appropriate for a growing dog.
That single sentence tells you more than the entire front of the bag.
Reading the bag, line by line
Most of the front of a bag is unregulated marketing. These are the parts that carry meaning.
| What you find | What it means | How much weight to give it |
|---|---|---|
| “Animal feeding tests using AAFCO procedures substantiate…” | Dogs ate this food and were monitored | High. The strongest single line on the bag |
| “Formulated to meet the AAFCO nutrient profiles…” | The recipe was calculated on paper | Acceptable, one tier below feeding trials |
| Life stage named: growth, maintenance, all life stages | Who the food is legally suitable for | High, especially for puppies and large breeds |
| Calorie content per cup or can | What you need to feed the right amount | High. A company that cannot state it quickly is a warning |
| Guaranteed analysis percentages | Minimums and maximums, not actual amounts | Low on its own. Not comparable between wet and dry |
| Ingredient order | Weight before cooking, so fresh meat rises artificially | Low. The most over-read part of any label |
| Grain free, ancestral, human grade, holistic | Marketing terms with no legal definition | None |
| Made in a facility we own vs contract manufactured | Whether a recall can be traced quickly | Moderate, and worth asking about directly |
The questions to ask any brand, including this one
WSAVA publishes a short list of questions worth asking a manufacturer directly:
- Do you employ a full-time qualified nutritionist? A PhD in animal nutrition, or board certification with ACVN or ECVCN.
- Who formulated the diet, and what are their credentials?
- What is your quality control process for ingredients and finished products?
- Are your diets substantiated by AAFCO feeding trials, or by formulation?
- Will you provide a complete nutrient analysis for the specific product?
- Where is the food manufactured?
- Do you own the plant, or is production contracted out? Contract manufacturing makes a recall harder to trace.
- What is the calorie content per cup or can? A company that cannot answer that quickly is a warning in itself.
A company that answers these clearly is telling you something. A company that dodges them is also telling you something.
Apply the list to every brand you consider, including the ones with the biggest presence at ringside.
Comparing two foods without being misled
Bag prices and protein percentages are the two figures owners compare, and both mislead.
Compare cost per day, not cost per bag. Divide the bag price by the number of days it feeds your dog at the correct portion. A denser food costs more per bag and often less per day.
Compare nutrients on a dry matter basis. A canned food showing 10% protein and a kibble showing 26% are not far apart once you account for the water. Percentages straight off the bag cannot be compared across wet and dry.
Ask for the full nutrient analysis, not the guaranteed analysis. The guaranteed analysis gives minimums and maximums. The full analysis gives actual typical values, and any company with a nutritionist on staff can send it.
Ignore the ingredient panel as a ranking tool. Ingredients are listed by pre-cooking weight, so fresh chicken outranks chicken meal on the label while contributing less protein after processing.
Change one thing at a time. If you switch food, treats and supplements in the same two weeks, you will not know what caused the change you see.
The formula the winners eat is probably not the right one for your dog
Show handlers often reach for the high-protein, high-fat performance formulas, and the 2026 Best in Show winner was fed one of them.
But those formulas exist for dogs doing sustained physical work: field trials, sled work, serious agility. A conformation dog trots around a ring for a few minutes.
Feeding a performance diet to a dog with a modest workload is one of the more common ways to end up with a dog carrying too much condition, the opposite of what a judge wants to see. Match the formula to what your dog actually does, not to what the winner’s bag said.
Judges assess condition, not brand
The handling half of that is entirely trainable, and it moves results far more than any diet. See our obedience training guide.
Nobody in the ring knows what your dog eats. They can see body condition, muscle tone, coat, and how the dog moves.
Learn to score body condition by hand rather than by eye. Ribs should be easy to feel with light pressure under a thin fat covering, there should be a visible waist from above, and an abdominal tuck from the side. Do this weekly, because coat and daily familiarity hide gradual weight change remarkably well.
A dog in correct condition on a mid-range food beats a dog carrying extra weight on a premium one, every time.
Coat is a lagging indicator
The coat you present in November was grown over the preceding months. Diet changes take weeks to months to show, and a coat problem that appears suddenly is usually not nutritional at all.
Sudden coat deterioration, patchy loss, itching, or skin changes point toward parasites, allergy, endocrine disease, or stress far more often than food. Those need a veterinary diagnosis, not a different bag.
If you are going to make a nutritional change for coat, make it six months before it matters and evaluate it honestly.
Feeding through a show season
The season introduces variables that have nothing to do with which brand is in the bag.
- Bring your own food and water. Both are common causes of weekend digestive upsets, and both are avoidable with a jug and a sealed container.
- Weigh the portions rather than scooping. Scoops drift, and a dog that gains half a pound a month arrives in the ring carrying condition nobody intended.
- Feed lightly before a long drive. A smaller meal several hours ahead is easier on a dog that travels poorly.
- Do not use the show as a reason to add something new. New supplements, new treats and new bait all belong in the off-season.
- Score body condition by hand every week. Coat and daily familiarity hide gradual weight change well enough that the scale and your hands should both be involved.
- Watch water intake in hot venues. Dogs drink less from unfamiliar bowls in noisy places, and mild dehydration shows in the coat before it shows anywhere else.
Never change food close to a show
Any transition needs a week to ten days of gradual mixing, and even done properly it can produce loose stools in a sensitive dog.
The week before a major entry is the worst possible time to introduce a variable. If you are going to switch, do it in the off-season when a bad week costs you nothing.
The same applies to travel: bring your own food and your own water where you can. Both are common causes of show-weekend digestive upsets, and both are avoidable.
Supplements: more is not better, and some of it is actively risky
Joint supplements, fish oils, coat products, and vitamin blends circulate constantly in show circles. A few have reasonable evidence behind them. Many do not.
Two things worth knowing.
A complete and balanced diet already contains the required nutrients. Adding vitamin and mineral supplements on top of it can push certain nutrients past safe levels rather than improving anything. Fat-soluble vitamins in particular accumulate.
Growing large-breed puppies are the highest-risk group. Calcium supplementation on top of a properly formulated growth diet is associated with developmental orthopedic problems, not stronger bones.
Talk to your veterinarian before adding anything, and be specific about what your dog already eats. It cannot hurt is not true of supplements.
Free tool
Judges assess condition and handling, not brand. See where your dog’s cues actually sit across six skills, weighted by proofing level.
Signs a food is not suiting your dog
The only meaningful test of a diet is the dog eating it. These are the things to watch, and none of them appear on a bag.
Stools that stay loose beyond the transition period. Ten days of gradual mixing should settle it. Longer than that is information.
Weight moving in either direction without a change in exercise. Check the portion against the calorie content before blaming the formula.
Coat that dulls over months. Slow change can be dietary. Sudden change, patchy loss or itching points at parasites, allergy, or endocrine disease and needs a veterinary appointment rather than a different bag.
Persistent gas or discomfort after meals. Worth raising with your vet, particularly in deep-chested breeds where feeding routine matters for other reasons.
Reluctance to eat a food the dog previously liked. Rule out dental pain and nausea before assuming fussiness.
Bloodwork that shifts at the annual check. Your vet is the one who should interpret that, and diet is one input among several.
The food is the smallest variable
This is the part the marketing never says.
What separates dogs that win from dogs that do not, in rough order: structure and breeding, conditioning and muscle development, grooming skill, handling skill, ring presence and temperament, and the dog’s willingness to show itself off on the day.
Nutrition supports every one of those. It does not produce any of them. A structurally average dog on a champion’s diet is still a structurally average dog.
If you are new to the sport and looking for the thing that will move you up the placings, it is almost never in the bag.
So should you feed it?
If you are already feeding Pro Plan and your dog is thriving, meaning good weight, good coat, good energy, firm stools, and normal bloodwork, there is no reason to change.
If you are choosing a food, use the criteria in points 3 and 4 rather than the ringside statistic. Several large manufacturers meet those criteria. Pro Plan is one of them, and it is not uniquely one of them.
And whatever you feed, judge it on your own dog. Weight, coat, energy, digestion, and vet checks tell you more about whether a food suits your dog than any Best in Show record ever will.
Watch the training in action
PawMastery on YouTube — 149,000+ subscribers following along with real training sessions.
Frequently asked questions
Is Purina Pro Plan good for dogs?
It is made by a company that meets the criteria veterinary nutritionists use: in-house qualified nutritionists, feeding trials, quality control, and published research. Whether a specific formula suits a specific dog is a separate question, best judged on your own dog’s condition and answered with your vet.
Why do so many show dogs eat Pro Plan?
Because Purina is the exclusive pet food sponsor of the major US shows and runs a sponsorship program aimed at breeders and handlers. It reflects the brand’s position in the sport rather than a demonstrated effect on results.
Does dog food affect show results?
Indirectly, through body condition and coat quality, both of which judges assess. No food has been shown to improve placement, and no brand claims that in a form they would have to substantiate.
What is the difference between formulated to meet and feeding trials on a label?
Formulated to meet means the recipe was calculated to hit AAFCO nutrient levels. Feeding trials means dogs were fed the food and monitored under AAFCO protocols. The second is a higher standard.
Should I feed a performance formula to my show dog?
Only if the dog’s workload justifies it. Performance formulas are built for sustained physical work, and a conformation dog with a light routine may simply gain weight on one.
Do show dogs need supplements?
A complete and balanced diet already provides required nutrients. Supplementing on top can push some nutrients past safe levels, and calcium supplementation in growing large-breed puppies is specifically associated with orthopedic problems. Ask your vet before adding anything.
When should I switch my dog’s food before a show?
Not close to one. Transition over seven to ten days, and do it well outside the season when a digestive upset costs nothing.
How do I compare the price of two foods fairly?
Work out the cost per day at the correct portion for your dog, using the calorie content rather than the bag weight. A denser food often feeds further than a cheaper bag suggests.
Does the ingredient list tell me how good a food is?
Less than most people assume. Ingredients are ordered by weight before cooking, so fresh meat appears higher than it contributes. The nutritional adequacy statement and the company behind the food tell you more.
Is grain free better for show dogs?
The term has no legal definition and no established advantage for a dog without a diagnosed grain issue. Discuss diet changes of this kind with your veterinarian rather than with the aisle.
How long should I give a new food before judging it?
Transition over seven to ten days, then give it several weeks for digestion and a few months for coat. Judging a food in the first two weeks tells you about the transition, not the food.
This article discusses how to evaluate pet food claims. It is not veterinary advice and is not a substitute for it. Diet decisions for a dog with a health condition, a growing large-breed puppy, or a dog with digestive or skin problems should be made with your veterinarian, ideally one working with a board-certified veterinary nutritionist.
Sources
- WSAVA Global Nutrition Guidelines — the questions to ask a manufacturer
- AAFCO: understanding pet food labels
- Tufts Cummings School: how to read a pet food label
- FDA: what “complete and balanced” means
- AVMA: selecting a pet food
- ASPCA: dog nutrition tips
- Purina: Westminster Kennel Club Dog Show sponsorship and results
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