🥩 How Nutrition Needs Shift as Dogs Age Senior dogs often experience natural changes in digestion, metabolism, and activity. These shifts influence how well they utilise nutrients and how easily they maintain muscle, weight, and energy. Common age‑related changes include: Slower digestion and reduced nutrient uptake Changes in mobility and activity levels Altered appetite or interest in food Shifts in body composition (muscle vs. fat) A gradual decline in metabolic efficienc