Pregnancy & Heat Calculators
Dog and cat due dates and heat cycles. Each calculator shows its formula and its sources.
Dog Pregnancy Calculator
Dog due date from the mating date, with the normal window and vet check dates.
Dog Heat Cycle Calculator
Predict your dog’s next heat and the fertile days from her last heat.
Cat Pregnancy Calculator
Cat due date from the mating date, with the normal 60–67 day window.