Ration

A ration is the amount of food given to an animal over a defined period, most often a single day, and getting it right is calculated rather than guessed. The calculation starts from the animal's energy requirement, which itself depends on weight, age, activity, physiological status, and current body condition: one begins from the maintenance energy requirement and then adjusts according to the goal, whether holding weight steady, losing, or gaining. The food's energy value, expressed in kilocalories, is what converts that requirement into a number of grams (NRC, 2006). Manufacturer feeding tables provide a reasonable starting point, but they describe an average animal and routinely over- or under-estimate the needs of a specific one, which is why regular monitoring of weight and body condition score is essential for fine-tuning. The stakes are clear in both directions: an overly generous ration drives excess weight, the most common nutritional disorder in dogs and cats, while an insufficient one can cause loss of body mass and muscle. A practical detail that genuinely improves accuracy is to weigh the ration on a kitchen scale rather than measuring it by volume, because a scoop or cup introduces a surprisingly large and repeatable error from one meal to the next, an error that accumulates over weeks into meaningful over- or underfeeding. The ration is the foundation that [portion control](/glossary/portion-control), [split meals](/glossary/split-meals), and any [light diet](/glossary/light-diet) plan all build upon, and it must be recalculated as the animal's circumstances change. For more, see the [Petipedia glossary](/glossary).

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