Dog Heat Cycle Calculator
Track your female dog's heat cycle and predict when the next one will occur
Heat Cycle Tracking
Keep detailed records of your dog's heat cycles. This calculator provides estimates - individual dogs may vary significantly.
Calculate Heat Cycle
When did you first notice signs of heat (bleeding, swelling)
Time between heat cycles (varies by breed and individual)
🔄 Heat Cycle Phases
Proestrus
7-10 daysBleeding begins, vulva swells
Not fertile yet
Estrus
5-14 daysOvulation occurs, most fertile period
Highly fertile - breeding time
Diestrus/Metestrus
60-90 daysNo longer fertile, hormone levels normalize
Not fertile
Anestrus
90-150 daysRest period between cycles
Not fertile
Signs of Heat Cycle
Watch for these signs to identify when your dog's heat cycle begins:
Swelling of the vulva
Vaginal discharge/bleeding
Increased licking of genital area
Mood changes (clingy or grumpy)
Appetite changes
Tail tucking (early) then flagging (later)
Increased urination
Flirting with male dogs
🐕 Breed Variations
Small Breeds
Chihuahua, Pomeranian
First heat: 4-6 months
Frequency: Every 4-6 months
Medium Breeds
Beagle, Border Collie
First heat: 6-8 months
Frequency: Every 6 months
Large Breeds
Golden Retriever, German Shepherd
First heat: 8-12 months
Frequency: Every 6-8 months
Giant Breeds
Great Dane, Mastiff
First heat: 12-24 months
Frequency: Every 8-12 months
📋 Important Notes
Young dogs may have irregular cycles
Keep detailed records for accuracy
Keep away from males during entire heat
Spaying prevents heat cycles permanently
Consult vet for irregular or missed cycles
Prevention Options
Spaying (Ovariohysterectomy)
Permanent solution
Prevents heat cycles and pregnancy
Temporary Medications
Megestrol acetate, Mibolerone
Veterinary consultation required
Management
Careful supervision during heat
Doggy diapers for indoor comfort
Understanding Dog Heat Cycles
The Complete Cycle
A dog's heat cycle typically lasts 2-3 weeks of visible signs, but the complete reproductive cycle spans 4-8 months. Understanding each phase helps with proper management and breeding decisions.
Key Timing Facts
- •First heat: 4-24 months depending on breed size
- •Frequency: Every 4-12 months (6 months average)
- •Fertility: Highest during estrus phase (days 9-21)
Calculation Method
Next Heat Date =
Last Heat Date + Cycle Length
Individual Variations
- Age: Young dogs may be irregular
- Breed: Size affects timing and frequency
- Health: Stress and illness can delay cycles
- Environment: Seasonal patterns in some dogs
🎯 Remember: This calculator provides estimates based on averages. Individual dogs may vary significantly from these predictions.