Dog Heat Cycle Calculator

Track and predict your female dog's reproductive cycle for better care and breeding planning.

The average canine heat cycle occurs every 6-12 months and lasts 2-4 weeks.
Please select the start date of last heat cycle.
Please select your dog's breed size.

Canine Reproductive Guide

Small Breeds
  • First heat: 6-12 months old
  • Cycle frequency: Every 4-6 months
  • Often more obvious signs
  • May have irregular cycles initially
Large/Giant Breeds
  • First heat: 12-24 months old
  • Cycle frequency: Every 8-12 months
  • More subtle signs sometimes
  • Generally more regular cycles
Important: Breeding before the 3rd heat cycle (or before 2 years for large breeds) is not recommended for optimal health.

Risks of Intact Females
  • Pyometra (life-threatening uterine infection)
  • Mammary cancer risk increases with each heat
  • False pregnancies common after heat
  • Behavioral changes during cycles
Preventative Care
  • Track all heat cycles carefully
  • Consider spaying if not breeding
  • Watch for abnormal discharge
  • Maintain ideal body weight
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Heat Cycle Warning Signs
  • Black/green discharge (possible infection)
  • Excessive licking (may indicate discomfort)
  • Lethargy/loss of appetite
  • Heat lasting over 4 weeks