Proestrus: The female attracts males, has a bloody vaginal discharge and her vulva is swollen. Proestrus lasts approximately nine days; the female, however, will not allow coitus at this time.
英
美
- 发情前期:母犬开始引诱公犬,阴道有血渗出,阴户涨大。发情前期约持续九天,不过,这段时间,母犬并不与公犬交配。