What's actually in Purina Pro Plan Senior?
We analyzed Purina Pro Plan Complete Essentials Adult 7+ Chicken & Rice Senior Dry Cat Food. The first five ingredients are chicken, rice, corn protein meal, poultry by-product meal, and wheat flour.
Chicken as the first ingredient is a named, whole animal protein — a reasonable start. Rice at number two is a digestible, low-allergen carbohydrate that's gentle on senior digestive systems. So far, acceptable.
Then it falls off. Corn protein meal at number three is a plant-based protein booster that inflates the total protein percentage without providing the complete amino acid profile cats need. Poultry by-product meal at number four is a vague, non-specific animal protein — it could come from any poultry species, and "by-product" means organs, necks, feet, and intestines rather than muscle meat. Wheat flour at number five is a cheap binding agent and filler with minimal nutritional value for cats. Shop on Amazon →
The good stuff
Real chicken leads the formula. For a mainstream senior cat food at this price point, having a named animal protein first — not a grain, not a by-product — is worth acknowledging. Many budget and mid-tier brands can't say the same.
Dried chicory root is a genuine prebiotic fiber that feeds beneficial gut bacteria. For senior cats, whose digestive efficiency naturally declines with age, prebiotic support is more than a marketing bullet point — it helps maintain nutrient absorption when the gut is slowing down.
The probiotic inclusion (Bacillus coagulans) is another senior-relevant choice. Live probiotic cultures support healthy gut flora and can help with the digestive irregularities that commonly affect older cats. Not all cat foods include a named probiotic strain, so this is a genuine differentiator.
Fish meal provides omega-3 fatty acids (EPA and DHA) that support joint health, cognitive function, and coat condition — all areas of concern in aging cats. Dried egg product is a highly digestible, complete protein source with an excellent amino acid profile. Taurine is supplemented, which is essential — cats cannot synthesize it on their own, and deficiency leads to serious heart and vision problems.
The not-so-good stuff
Corn protein meal is the biggest issue. It's a concentrated plant protein extracted from corn that exists primarily to boost the protein percentage on the guaranteed analysis panel. For an obligate carnivore like a cat, plant protein is not equivalent to animal protein — it lacks adequate taurine, arginine, and other amino acids cats specifically need. When you see corn protein meal at number three, the protein number on the bag is less meaningful than it looks.
Poultry by-product meal is a vague ingredient. It's not chicken-specific — it could be turkey, duck, or any combination of poultry species. The "by-product" designation means this is made from parts other than muscle meat: organs, necks, feet, undeveloped eggs, and intestines. While some by-products have nutritional value (liver, for example), the lack of specificity makes quality impossible to evaluate from the label alone.
Wheat flour serves primarily as a binder and filler. It provides starch for kibble structure but adds little nutritional benefit for cats. Some cats are sensitive to wheat gluten, making this a questionable choice for a senior formula where digestive tolerance is already a concern.
Soy protein concentrate is another plant protein booster. Between corn protein meal and soy protein concentrate, two of the protein sources in this food are plant-derived fillers rather than the animal protein cats are biologically designed to eat.
Caramel color is an unnecessary artificial coloring agent. Cats don't care what color their food is — this ingredient exists solely for the owner's perception. Some caramel colorings contain 4-MEI, a compound that has raised health concerns in research. There's no nutritional reason for it to be in any pet food.
Natural flavor is a vague palatability enhancer. The term "natural" is loosely regulated in pet food, and the actual source of the flavor is not disclosed. It's not harmful, but it's another ingredient that obscures what's actually in the food.
How it compares
Purina Pro Plan Senior Cat scores two points higher than the standard Purina Pro Plan Cat (C/56), which shares similar weaknesses — corn protein meal, poultry by-product meal, and wheat flour all appear in both formulas. The senior version edges ahead with its probiotic and prebiotic additions, which are genuinely relevant for older cats.
Hill's Science Diet Cat (C/60) sits two points above at the same grade tier. Hill's trades the corn protein meal for its own set of compromises, but the gap between these two is marginal — both are squarely average mainstream cat foods.
For a deeper side-by-side breakdown, read our full comparison: Purina Pro Plan Senior Cat vs Hill's Science Diet Cat.
The bottom line
Purina Pro Plan Complete Essentials Adult 7+ earns a C grade (58/100) from KibbleIQ. The chicken-first formula and senior-specific additions like probiotics and chicory root show that Purina put some thought into the aging cat's needs. But corn protein meal, poultry by-product meal, wheat flour, soy protein concentrate, and caramel color weigh the formula down. The protein quality is diluted by plant-based boosters, and the vague sourcing on the by-product meal doesn't inspire confidence. If your senior cat is doing well on it, there's no urgent reason to switch — but if you're shopping for a new food, there are cleaner options at similar price points. Shop on Amazon →