Best 6 Complete Pelleted Diets for Senior Rats and Mice in Canada 2026

Oxbow Essentials holds its position as a pet-focused, timothy-hay based pelleted diet formulated to support senior rats and mice with higher fiber, lower fat, and gentle ingredients that support digestion and dental wear. Compared with the denser, research-style formulations on this list (Mazuri and Envigo), Oxbow prioritizes natural forage ingredients and palatability, making it an accessible, low-risk transition diet for older animals. Financially it is positioned as a mid-priced, widely available option that balances ingredient quality with value for pet owners managing long-term senior care.

Mazuri 5663 is a concentrated, nutrient-dense pelleted diet with tight specification and micronutrient fortification that makes it attractive for senior rats and mice needing reliably elevated nutrient delivery in smaller rations. In comparison to Oxbow and Burgess, Mazuri delivers higher and more consistent levels of protein and vitamins, and though typically costlier per kilogram, that density can be more economical for older animals with reduced intake. Technically it is favored where precise, reproducible nutrition is important, offering a market-leading balance of research-quality formulation and commercial availability for advanced pet and colony management.

Supreme Science Selective Rat Food stands out for palatable, extruded pellets designed for selective eaters and older rodents, balancing moderate protein with elevated fiber to support digestion and weight management. Compared with bulk or topper-style offerings like Living World, it provides a compact, complete diet that is competitive with premium options while remaining widely available in pet retail channels.

Envigo Teklad Global 2018 is a research-grade pelleted diet engineered for minimal variability and controlled nutrient composition, which benefits senior rodents by minimizing confounding dietary contaminants and providing stable maintenance nutrition. Against the other products, Teklad is the most consistent lot-to-lot and lab-proven choice, making it ideal for owners or facilities prioritizing predictable physiological responses over lower-cost alternatives. While it sits at a premium price, the technical advantage of tightly controlled formulation and low phytoestrogen/contaminant profile justifies its use for sensitive senior animals and institutional settings.

Burgess Rat Nuggets are a traditional, economical pelleted option that provide basic complete nutrition in a straightforward, hard-nugget format well suited to owners on a budget caring for senior rats and mice. Compared with the higher-spec Mazuri and Envigo diets, Burgess emphasizes affordability and wide retail availability rather than research-grade micronutrient precision, making it a practical choice for routine long-term feeding when cost is the primary constraint. Its financial advantage is clear for multi-animal households and rescue situations, though buyers should weigh that against potential needs for targeted supplements in geriatric care.