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🐶 Canine Heat Cycle Calculator
Heat stages • Breeding window • Due date
Basic
Advanced
Basic Information
First Day of Heat (Proestrus)
Dog Size
Small Breed
Medium Breed
Large Breed
Calculate
Advanced Breeding Details
First Day of Heat (Proestrus)
Dog Size
Small Breed
Medium Breed
Large Breed
Average Cycle Length (days)
Gestation Length (days)
Calculate
Heat Cycle Overview
Proestrus: ~9 days
Estrus (fertile): days 9–15
Diestrus: ~60 days
Anestrus: recovery phase