Dog Heat Cycle Calculator
Understanding Heat Cycles
Key Facts:
- First heat: Usually between 6-12 months
- Cycle length: Typically every 6-8 months
- Heat duration: 2-4 weeks total
- Fertile period: Days 9-14 typically
Heat Cycle Stages
Proestrus (9 days)
- Swollen vulva
- Bloody discharge
- Male attraction begins
- Not receptive to males
Estrus (9 days)
- Discharge lightens
- Receptive to males
- Ovulation occurs
- Fertile period
Diestrus (60-90 days)
- No longer receptive
- Discharge stops
- Pregnancy or rest phase
- Hormonal changes
Anestrus (3-4 months)
- Sexual inactivity
- Reproductive rest
- Hormone levels low
- Body prepares for next cycle
Breed Size | Average Cycle Length | First Heat Age |
---|---|---|
Small Breeds | 6 months | 6-8 months |
Medium Breeds | 6-7 months | 8-10 months |
Large Breeds | 7-8 months | 10-14 months |