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Nulo FreeStyle High-Protein Senior Trout & Sweet Potato Recipe Dry Dog Food Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food

Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food scores higher on KibbleLab, 8.4 to 8.3. Compare ingredients, guaranteed analysis, and AAFCO nutritional adequacy, side by side.

Nulo FreeStyle High-Protein Senior Trout & Sweet Potato Recipe Dry Dog Food and Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food compared

Nutrients:
As Fed
Nulo FreeStyle High-Protein Senior Trout & Sweet Potato Recipe Dry Dog Food
Nulo FreeStyle High-Protein Senior Trout & Sweet Potato Recipe Dry Dog Food

Verified Jul 24, 2026

Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food
Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food

Verified Jul 19, 2026

KibbleLab score The KibbleLab expert rating, 0 to 10, based on published veterinary science. No one can pay for a higher score.
8.3 / 10 8.4 / 10
Guaranteed analysis (as fed)
Protein Guaranteed analysis gives label minimums and maximums, not measured values, shown as fed.
30.00% 31.00%
Fat 12.00% 14.00%
Fiber 5.00% 5.00%
Calcium 1.00% Not listed
Phosphorus 0.90% Not listed
Omega-3 0.35% 2.90%
Omega-6 1.30% 2.90%
Taurine 0.10% 0.20%
Moisture Higher moisture means a wetter food; it dilutes the other percentages above.
10.00% 10.00%
Calories 3257 kcal/kg 3600 kcal/kg
Calorie density Moderate Moderate
Ingredients
Full ingredient list Every ingredient on each label, in order of weight.
Deboned Trout, Turkey Meal, Salmon Meal, Lentils, Chickpeas, Whole Peas, Sweet Potato, Ground Flaxseed, Deboned Turkey, Natural Flavor, Chicken Fat (preserved with Mixed Tocopherols & Citric Acid), Pea Fiber, Dried Tomatoes, Yeast Culture, Potassium Chloride, Salt, Dried Chicory Root, Choline Chloride, L-Carnitine, Taurine, Vitamin E Supplement, DL-Methionine, Dried Blueberries, Dried Apple, Dried Carrots, Chondroitin Sulfate, Glucosamine Hydrochloride, Zinc Proteinate, Zinc Sulfate, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Iron Proteinate, Niacin Supplement, Ferrous Sulfate, Copper Proteinate, Copper Sulfate, Vitamin A Supplement, Manganese Proteinate, Thiamine Mononitrate, d-Calcium Pantothenate, Riboflavin Supplement, Dried Bacillus coagulans Fermentation Product, Pyridoxine Hydrochloride, Manganous Oxide, Biotin, Vitamin B12 Supplement, Ethylenediamine Dihydroiodide, Folic Acid, Sodium Selenite, Vitamin D3 Supplement, Calcium Iodate, Rosemary Extract. Show full list
Trout, Salmon Meal, Chickpeas, Peas, Sunflower Oil, Dehydrated Alfalfa Meal, Natural Flavor, Salmon Oil, Flaxseed, Potassium Chloride, Calcium Carbonate, Tricalcium Phosphate, Choline Chloride, Salt, Vitamins (Vitamin E Supplement, Vitamin A Supplement, Niacinamide, d-Calcium Pantothenate, Riboflavin, Thiamine Mononitrate, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Biotin), Taurine, Minerals (Zinc Proteinate, Iron Proteinate, Copper Proteinate, Sodium Selenite, Manganese Proteinate, Calcium Iodate), Mixed Tocopherols (Preservative), L-Carnitine, Rosemary Extract, Dried Bacillus Coagulans Fermentation Product, Dried Bacillus Subtilis Fermentation Product, Dried Bifidobacterium Bifidum Fermentation Product. Show full list
Limited ingredient No Yes
Health focus Immune support, Probiotic support, Digestive health, Joint care, Metabolic support, Allergy support Probiotic support, Digestive health, Skin coat health, Joint care, Sensitive stomach
Format & suitability
Food type Dry Dry
Texture Kibble Kibble
Processing Not listed Not listed
Life stage Senior All Life Stages
Breed size All Breed Sizes Small
AAFCO nutritional adequacy
Complete & balanced Whether the manufacturer's label claims the food meets AAFCO nutrient profiles for a life stage. Not an independent test.
Yes Yes
Life stages Adult Maintenance All Life Stages, Large Breed Growth (70+ lbs)
Substantiation How adequacy was established. Feeding trials are the higher bar; formulation means the recipe is calculated to meet the profile.
Formulation Formulation
Maker standards
WSAVA guidelines The World Small Animal Veterinary Association publishes criteria for evaluating a manufacturer: qualified nutritionists on staff, feeding trials, and published research. It does not certify or endorse brands.
No No
PSC accredited The Pet Sustainability Coalition is a nonprofit that accredits pet companies on their environmental and social impact through third-party verification. It reflects sustainability practices, not food quality.
No No
Recalls & where to buy
Recalls on record KibbleLab began logging recalls in July 2026, so earlier recalls may not appear.
None None
Where to buy
Amazon
Amazon

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Shared ingredients

Both foods list these among their top ingredients, by label weight.

  • Trout
  • Salmon
  • Chickpea
  • Pea
  • Flaxseed
  • Natural Flavor

Not sure which is right for your pet?

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Common Questions

Which food scores higher on KibbleLab?

Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food scores higher, 8.4 to 8.3 out of 10. Scores reflect published veterinary science, and no one can pay for a higher score.

Do these two foods share ingredients?

Yes. They share these top ingredients: Trout, Salmon, Chickpea, Pea, Flaxseed, Natural Flavor.

Are both foods AAFCO complete and balanced?

Yes, both foods are labeled AAFCO complete and balanced.

See the full profiles: Nulo FreeStyle High-Protein Senior Trout & Sweet Potato Recipe Dry Dog Food and Zignature Original Small Bites Trout & Salmon Formula Dry Dog Food .

KibbleLab provides informational content only. This is not veterinary advice. Always consult a qualified veterinarian before changing your pet's diet.

This is a neutral, factual comparison, not a ranking or an endorsement of either product. A food's guaranteed analysis gives legal minimums and maximums for a few nutrients, not measured values. No one can pay for placement or a higher score.

Product details are compiled from public sources and may not reflect the latest formulation. Represent one of these brands? Request a correction. Anyone else can email us.