Dog Heat Cycle Calculator
Your details
Last heat start date
i
The first day you noticed signs of heat (bloody discharge, vulva swelling). If unsure, use the middle of the likely window.
Breed size
i
Smaller dogs cycle more often (every 5-6 months); giant breeds may only cycle every 8-12 months.
Small (under 20 lb / 9 kg)
Medium (20-50 lb / 9-23 kg)
Large (50-100 lb / 23-45 kg)
Giant (over 100 lb / 45 kg)
Dog age
i
Age in months. Under 18 months, cycles may still be irregular as the dog matures. Very senior dogs (over 10 years) may experience longer or less predictable cycles.
months
Known cycle length
i
If you have tracked previous cycles and know the average length, enter it here (the normal interval between heats is 4-13 months, so 120-400 days). Leave at 0, or enter anything under 120 days, to use the breed-size average instead.
days
Reset
Next heat start (estimated)
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Fill in your details to see the result.
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