Yorkie Heat Cycle Calculator
| Stage | Duration | Description |
|---|---|---|
| Proestrus | 7-10 days | Initial stage marked by vaginal discharge |
| Estrus | 5-10 days | Fertile period, receptive to mating |
| Diestrus | 60-90 days | Non-receptive phase, hormonal changes occur |
| Anestrus | 4-6 months | Resting phase, no sexual activity |