Breeding & Health
Enter the first day of your dog's heat cycle and cycle length to estimate optimal breeding days.
Usually 5-21 days, use 9 if unsure
Understanding each stage helps you time breeding correctly.
| Stage | Typical duration | Common signs |
|---|---|---|
| Proestrus | 4-7 days | Vulva swelling, bloody discharge; she attracts males but refuses mating |
| Estrus | 4-13 days | Discharge lightens; she accepts males. Ovulation usually occurs around days 9-13 |
| Diestrus | 60-90 days | No longer receptive; pregnancy or a rest phase follows |
| Anestrus | 4-6 months | Inactive phase before the next heat cycle begins |
Watch for these common signs of the heat cycle:
Swelling of the vulva and frequent licking of the area
Bloody or straw-colored vaginal discharge
Increased urination and scent marking
Behavior changes such as restlessness, clinginess, or seeking attention
Male dogs showing increased interest in her
Schedule a veterinary check-up before breeding to confirm she is healthy
Use progesterone testing or vaginal cytology to pinpoint the fertile window
Provide good nutrition and keep her free from stress during the season
Introduce the pair in a calm, familiar environment for natural mating
A second mating 24-48 hours later can increase the success rate
This calculator provides estimates only. Always consult your veterinarian for breeding advice.