What's actually in Merrick Puppy?
We analyzed Merrick Classic Healthy Grains Puppy Chicken & Brown Rice Recipe. The first five ingredients are deboned chicken, chicken meal, brown rice, barley, and oat meal.
Deboned chicken (fresh, ~80% moisture) provides the wet-weight protein anchor. Chicken meal (concentrated rendered chicken, roughly 3× denser than fresh) in position two is the true protein-density driver. The chicken + chicken meal combo delivers more actual post-cooking animal protein than chicken-only-first formulations.
The carb base is three whole grains: brown rice (#3), barley (#4), oat meal (#5). This is the "Healthy Grains" line's defining feature — Merrick intentionally avoids corn, wheat, and soy, using whole grains that carry more fiber, protein, and B vitamins than their refined counterparts. For puppies without grain sensitivities, whole grains are arguably nutritionally superior to legume-heavy grain-free alternatives.
Salmon meal sits in position six. This is the DHA source — salmon meal is a concentrated marine protein carrying the long-chain omega-3 fatty acids puppies need during the 0-12 month brain and retinal development window. Dedicated salmon meal (not just fish oil) is an ingredient-quality signal. Shop on Amazon →
The good stuff
Three animal proteins in the top ten ingredients. Beyond the chicken pair, the formula adds salmon meal (#6) and turkey meal (#12). Protein diversity matters for puppies — different proteins carry slightly different amino acid profiles, and cross-source diets are insurance against any single source being limiting in lysine, methionine, threonine, or tryptophan.
Quinoa as a functional ingredient. Quinoa (position 11) is a complete plant protein — one of few plants containing all nine essential amino acids. It contributes additional protein density beyond the animal sources and is a nutritional upgrade versus brewers rice or refined grains.
Supplemental taurine is listed in the ingredient deck. Merrick's decision to add taurine regardless of grain-inclusive formulation is a belt-and-suspenders choice — grain-inclusive diets are not implicated in the DCM investigation, but supplementation removes any marginal risk.
Four-strain probiotic blend (Dried Enterococcus Faecium, Lactobacillus Acidophilus, L. Casei, L. Plantarum) supports microbiome development during the critical 0-6 month gut colonization window. Combined with Miscanthus grass (prebiotic fiber) and dried yeast, the gut-support stack is solid.
Apples, carrots, and dehydrated alfalfa meal provide antioxidant and micronutrient diversity. No artificial colors, flavors, or preservatives — chicken fat is preserved with mixed tocopherols (vitamin E) rather than BHA/BHT.
The not-so-good stuff
Canola meal (position nine). Canola meal is the byproduct of canola oil extraction and is a moderate-quality plant protein source. It is acceptable for adult maintenance but is a less bioavailable protein than animal sources. Its inclusion in position nine means its caloric contribution is modest.
Miscanthus grass (position 16) is a novel fiber ingredient — a fast-growing ornamental grass used as a cellulose alternative to beet pulp. Some reviewers flag it as a cheap filler, but AAFCO has accepted it as a legitimate fiber source and it serves a real nutritional purpose (stool quality, prebiotic support).
No Large Breed Puppy SKU within the Healthy Grains line. Merrick publishes a Grain Free Large Breed Puppy formula, but the Healthy Grains Puppy is a single all-breed SKU. Giant-breed puppies (projected adult weight 100+ lb) need calcium controlled below 1.8% dry matter. Owners of Great Danes, Mastiffs, Newfoundlands, and Saint Bernards should verify Merrick's published analytical guarantee with their vet or switch to the Grain Free Large Breed Puppy variant.
How it compares
Merrick Puppy's B/78 score ties Blue Buffalo Life Protection Puppy (B/78), Taste of the Wild High Prairie Puppy (B/78), Diamond Naturals Small & Medium Breed Puppy (B/78), and Canidae PURE Puppy (B/78), placing it firmly in the premium mainstream tier.
Against the top-tier A/90 grain-free quartet (Orijen Puppy, Acana Puppy, Nulo Puppy), Merrick Puppy trails by 12 points on animal content density. Against grain-inclusive rival Fromm Gold Puppy (A/90), Merrick trails by 12 as well — Fromm layers menhaden fish meal, chicken broth, and more animal protein diversity. But Merrick outscores Iams Smart Puppy (B/75) by 3, Hill's Science Diet Puppy (C/58) by 20, and Purina Puppy Chow (D/39) by 39 points.
For the head-to-head vs Merrick's adult Classic line, see our Merrick Puppy vs Merrick comparison. Adult Merrick Classic (B/80) scores two points higher because of broader animal-protein diversity (deboned turkey, lamb meal, duck meal in addition to chicken); Puppy simplifies the protein stack in favor of salmon meal DHA and supplemental taurine.
Who should choose Merrick Puppy over Merrick adult
Merrick Classic Healthy Grains Puppy is the right choice during the 0-12 month developmental window for puppies whose owners want grain-inclusive nutrition without corn, wheat, or soy. Salmon meal DHA, supplemental taurine, quinoa plant protein, and a four-strain probiotic blend tune the formulation for growth. At 12 months transition to Merrick Classic Healthy Grains Adult (B/80), which broadens protein diversity for maintenance. Giant-breed puppies should use Merrick's dedicated Grain Free Large Breed Puppy variant rather than this all-breed SKU. For value shoppers comparing this to Costco's option, Kirkland Nature's Domain Puppy (B/79) is one point lower on grain-free — Merrick is the grain-inclusive equivalent.
The bottom line
Merrick Classic Healthy Grains Puppy earns a B grade (78/100) from KibbleIQ. Chicken-first protein, chicken meal density, whole-grain carb base, salmon meal DHA, supplemental taurine, and a four-strain probiotic blend make this a clean grain-inclusive puppy formula. Canola meal and Miscanthus grass are minor ingredient-purist concerns, and giant-breed puppies need the Large Breed Grain Free variant instead. For the premium grain-inclusive mainstream, Merrick Healthy Grains Puppy is a credible, discipline-forward choice. Shop on Amazon →