Heat Cycle Tracker

Predict your dog's next heat cycle and plan ahead. Get reminders so you're never caught off guard.

Planning Tool Only

Heat cycles vary significantly between individual dogs. This calculator provides estimates based on averages and should not be used for breeding decisions. Consult your veterinarian for accurate fertility timing.

What breed is your dog? (optional)

Start typing to find your breed and auto-fill typical cycle length.

When did your dog's last heat start?

Enter the first day you noticed signs (swelling, discharge)

Average cycle length

4 months (120 days)5 months (150 days)6 months (180 days)7 months (210 days)8 months (240 days)9 months (270 days)10 months (300 days)12 months (365 days)

Most dogs cycle every 6 months (180 days). Small breeds may cycle more often.

Typical heat duration

2 weeks (14 days)2.5 weeks (18 days)3 weeks (21 days)4 weeks (28 days)

Most heat cycles last 2-4 weeks (average 21 days).

Heat Cycle Phases