Science6 min
Percentage and Per Mille — How to Calculate Them and How They Differ
How to calculate a percentage and a per mille of a number: the formulas, the difference between percent and per mille, converting fractions, and worked examples.
Blog — page 12
Animals6 min
Dog age in human years — how to convert it correctly?
The myth "1 dog year = 7 human years" no longer holds. We explain how breed size affects dog age conversion, with worked numeric examples.
Animals5 min
Cat age in human years — converter and life stages
How many human years does your cat have? We show the current cat age converter, life stages from kitten to senior, and a step-by-step example.
Animals6 min
How much food does a dog need per day? A practical guide with an example
How much food does a dog need per day? We explain how to portion dry and wet food based on weight, age and activity, with a worked numeric example.
Animals7 min
A dog's calorie requirement — the RER and MER formulas explained
How to calculate a dog's calorie requirement? We explain the RER = 70 × (kg)^0.75 formula, the MER factors, and show a full worked example.
Animals6 min
A dog's pregnancy — how long does it last and how to build a calendar?
How long does a bitch's pregnancy last and how to calculate the due date? We cover the length, week-by-week stages, signs, and a simple way to work out the date.
Animals7 min
The annual cost of keeping a dog in 2026 — how much does a dog really cost?
How much does keeping a dog cost per year in 2026? We break down spending on food, the vet, accessories and insurance, with a sample annual budget.
Animals6 min
The annual cost of keeping a cat in 2026 — a full spending budget
How much does a cat cost per year in 2026? We present spending on food, litter, the vet and accessories, plus a sample annual budget for keeping a cat.
Animals6 min
Pet insurance — is it worth it? A cost-benefit analysis
Does insuring a dog or cat pay off? We explain what a policy covers, how much it costs and when it makes sense, with a sample cost-effectiveness calculation.
Animals6 min
How much food does a cat need per day? Portioning step by step
How much food does a cat need per day? We explain portioning of dry and wet food based on a cat's weight and activity, with a sample portion calculation.
Animals6 min
A dog's ideal weight by breed — how to assess your pet's condition
What is the ideal weight for your dog's breed? We show weight ranges for popular breeds, the Body Condition Score (BCS) scale and a step-by-step assessment.
Health6 min
Due date — how to calculate it with Naegele’s rule
Naegele’s rule step by step: from the first day of your last period add 7 days and subtract 3 months. We explain the formula and show an example.