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Age-related changes in gastrointestinal function have been reported in companion animals, but the impact on digestive efficiency remains uncertain. Healthy dogs ( n = 37; 2.6-14.2 years) received four diets varying in total dietary fibre (TDF; 6-29%, as fed). Healthy cats ( n = 28; 1-13 years) received four diets with two fat (10-12%; 17-18%) and TDF (9 and 12%) levels. In a crossover design, diets were provided over four consecutive 10-day cycles, including a 4-day faecal collection. Apparent crude protein (CP), ether extract (EE), TDF, calcium (Ca), and phosphorus (P) digestibilities were determined. The effect of age was analysed as a continuous variable in dogs and as differences between adult (1-5 years) and senior (7-13 years) cats. In dogs, EE digestibility was unaffected by age ( p &gt; 0.10). Dogs of 6-12 years had higher digestibility of CP ( p = 0.032), TDF ( p = 0.019), Ca ( p = 0.019), and P ( p = 0.024) when fed the 6% TDF diet. Senior cats had greater digestibility of TDF ( p &lt; 0.01) and Ca ( p = 0.024) but had lower EE and CP digestibility with one diet (17% fat; 9%TDF) (age, p &gt; 0.10; diet × age, p &lt; 0.001). Healthy ageing was associated with preserved nutrient digestibility in dogs and cats within the age ranges studied. The effect of ingredient sources in senior cats warrants further investigation.

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Healthy Ageing Is Associated with Preserved or Enhanced Nutrient and Mineral Apparent Digestibility in Dogs and Cats Fed Commercially Relevant Extruded Diets