What’s in it
The top ingredients, in order: Chicken Meal, Corn Gluten Meal, Ground Wheat, Rice Flour, Poultry Fat (preserved with mixed tocopherols), Wheat Flour, Natural Flavor, Dried Meat By-Products, Brewers Yeast, Powdered Cellulose, followed by minerals (calcium carbonate, dicalcium phosphate, potassium chloride, salt, iron proteinate, zinc proteinate, copper proteinate, manganese proteinate, sodium selenite, potassium iodide), taurine, lecithin, B-vitamin panel, choline chloride, natural tocopherol preservation, and rosemary extract. Each Greenies Feline is approximately 1.4 kcal. The product carries the AAFCO “intermittent or supplemental feeding only” statement.
Greenies is a Mars Petcare brand (same parent as Temptations, Whimzees via WellPet partnerships, and Nutro). The Feline Original is the cat-sized version of the popular Greenies Dog dental treat — the dental-function positioning is central to the product.
The good stuff
VOHC Seal of Acceptance is the defining feature. The Veterinary Oral Health Council awards its seal only to products that complete specific clinical efficacy trials demonstrating measurable plaque or tartar reduction. Very few cat dental treats carry this seal — Greenies Feline and a handful of prescription-diet dental options are essentially it. Our rubric gives VOHC-accepted dental chews a +6 cumulative bonus (function-class +3 for dental-chew with VOHC + functional-claim +3 for verified VOHC seal), which is a significant rubric lift. Without the VOHC seal, this product would score meaningfully lower. Shop on Amazon →
Chicken meal as the first ingredient is the best available starting position for a grain-based crunchy cat treat. Chicken meal is rendered concentrated chicken (muscle + skin + bone), which is more protein-dense than whole chicken on a moisture-normalized basis. Our rubric awards +6 for named whole-muscle meat meal first (vs. +12 for whole muscle, or −15 for unnamed by-product meal).
Powdered cellulose at position ten provides mechanical-dental-abrasion — the gentle scrubbing action that removes surface plaque when cats chew the treat. This is the functional ingredient that enables the VOHC claim.
Taurine supplementation is included. Cats require dietary taurine for cardiac function and retinal health, so any cat treat ideally supplements taurine. Greenies Feline does.
1.4 kcal per treat is very low calorie density — among the lowest in any treat category. A 10-pound cat can eat 15–20 Greenies Feline per day (which is roughly the VOHC-recommended dosing for dental efficacy) while staying comfortably under the 10%-of-daily-calories ceiling.
Mixed tocopherol preservation and rosemary extract — natural preservation, no BHA, no BHT, no ethoxyquin. This is a meaningful improvement over mainstream mass-market cat biscuits like Friskies Party Mix or Temptations, which do use BHA and BHT.
No artificial colors. Greenies Feline is a neutral tan color from the natural ingredient panel, not artificially colored like most mainstream biscuit cat treats. Our rubric penalizes each artificial color at −6, so avoiding them is a major advantage (>+20 points compared to a four-color competitor).
There are no active FDA recalls or enforcement actions on Greenies Feline product line as of this review’s verification date.
The not-so-good stuff
Grain-heavy ingredient panel is the biggest rubric cost. Three grain-derived ingredients appear in positions 2, 3, and 4: corn gluten meal, ground wheat, and rice flour. Our rubric deducts −3 for wheat/corn/soy/rice in the top 3 of a dental-chew class (biscuit/dental-chew gets a softer −3 vs. the −6 for other classes). Wheat flour also reappears at position six as a supplemental binder. Collectively, the grain stack is functionally necessary for the crunchy-dental-abrasion texture but it’s the main structural differentiator from a grain-free competitor like Whimzees Stix (B/76) (which Greenies Feline doesn’t have a direct cat-treat analog of in the mainstream category).
Corn gluten meal at position two deserves specific callout. Corn gluten meal is a concentrated corn protein isolate — it’s used here to boost the guaranteed-analysis crude-protein percentage without adding animal-source protein content. Cats, as obligate carnivores, don’t efficiently utilize plant protein. The corn gluten meal is functionally there to hit protein specs on the label rather than to feed the cat biologically-appropriate amino acids.
“Dried Meat By-Products” at position eight is a vague ingredient. Unlike “chicken liver” or “beef heart” (which disclose exactly which organ is included), “dried meat by-products” could include any rendered organ meat or tissue from unspecified animal sources. Our rubric doesn’t heavily penalize this (−3 for vague by-product) but it does flag the transparency concern.
“Natural Flavor” at position seven is less transparent than named whole-food flavoring. Greenies doesn’t specify the source, though the product is sold as “Tuna Flavor” so the flavoring is presumably tuna-derived.
Chewiness may not appeal to every cat. Greenies Feline relies on the cat voluntarily chewing the treats for the VOHC-verified dental benefit to work. Some cats (particularly seniors with reduced chewing strength or cats that tend to gulp food) will swallow the treats whole, which eliminates the dental function entirely. For cats that gulp, the dental-claim is moot and a cleaner-panel alternative like PureBites (A/95) is a better use of the treat budget.
How it compares
Greenies Feline C/61 is the best VOHC-accepted mainstream dental treat for cats. Against the dental-chew category specifically, Greenies Feline is the default recommendation when VOHC-verified plaque control is the primary decision factor. There are very few comparable options — most cat dental treats make dental claims without the VOHC-documented evidence.
Against non-dental cat treats, Greenies Feline loses clearly on ingredient quality. PureBites Freeze-Dried Chicken (A/95) is 34 points higher. Inaba Churu Tuna (A/90) and Tiki Cat Stix Tuna (A/90) are 29 points higher. The tradeoff: those higher-scoring treats don’t make dental claims and don’t have VOHC verification. If dental function is not the reason you’re feeding, any of the A-tier alternatives is objectively cleaner.
Against the companion dog product Greenies Original Regular for Dogs (C/58), Greenies Feline scores 3 points higher primarily because of better calorie density (1.4 kcal for cat vs. 91 kcal for dog regular size) and cat-appropriate supplementation (taurine). The ingredient panels are conceptually similar — both are grain-based dental chews with VOHC acceptance and similar deductions.
Against mainstream mass-market biscuits — Temptations Classic (D/38), Friskies Party Mix (D/42) — Greenies Feline is a 19–23 point rubric improvement: no BHA, no BHT, no artificial colors, VOHC dental claim. If your cat currently eats Temptations or Friskies as a daily treat, switching to Greenies Feline adds dental function and removes multiple rubric deductions at similar per-day cost.
The bottom line
Greenies Feline Original Tuna earns a C grade (61/100) on KibbleIQ’s treats rubric — a functional-tradeoff product where the VOHC-verified dental claim carries the ingredient-panel weight. If your vet has flagged dental concerns and recommended a dental treat, Greenies Feline is the mainstream go-to. If your cat is dentally healthy and you’re feeding treats for enrichment or nutrition rather than dental function, the A-tier alternatives (PureBites, Inaba Churu, Tiki Cat Stix) are cleaner panels at comparable cost. For cats that gulp treats rather than chew, the VOHC claim doesn’t apply — in that case, the C/61 ingredient panel isn’t buying you the functional benefit you’re paying for, and an A-tier alternative makes more sense. See our Treats Rubric methodology for the full scoring logic. Shop on Amazon →