Houndmath

Working dog-care numbers, with the formula shown. Six dog-care calculators and 38 breed references — each one showing the equation it uses, naming where that equation came from, and saying plainly where it stops being reliable.

• Dog calorie calculatorDaily energy requirement from body weight and life stage.
• Dog food portion calculatorCalories converted into cups of your specific food.
• Dog age calculatorHuman-equivalent age from the 2020 epigenetic study.
• Dog ideal weight calculatorTarget weight, safe rate of loss and a timeline.
• Dog water intake calculatorExpected daily intake, and what a change means.
• Puppy adult weight calculatorAdult weight projected from current weight and age.

Why another set of pet calculators

The arithmetic behind these tools is not secret or difficult. What is usually missing is everything around it: which formula was used, who published it, what population it was fitted to, and how much confidence the answer deserves. A daily calorie figure quoted to the nearest unit implies a precision that the underlying method — accurate to roughly ±20% between individuals — does not have.

So every page here states its formula, links its source and marks its limits. Where a method only supports a range, the output is a range. Where no honest answer exists, there is no calculator: this site does not do medication dosing, and it does not publish "can my dog eat this" pages, because that would mean inventing facts about animal safety with no authoritative source behind them.

Breeds

The breed pages carry published adult weight and height ranges for 38 breeds, each recording the exact source revision it was built from. Their real function is to bound the calculators: a puppy growth projection checked against its breed's published adult range can tell you when it has produced an implausible answer, which a free-running projection cannot.