最後更新：2026年10月1日
已懷孕母犬再次發情並受孕，導致子宮同時存在不同發育階段胎兒。極罕見，可能導致早產或產程複雜。
Early spaying (before first estrus) reduces mammary carcinoma risk by > 90% in cats. Feline mammary tumors are highly malignant; radical mastectomy with wide margins is recommended. Cryptorchidism is less common in cats than dogs but still warrants surgical intervention.
極罕見，理論上可能發生
建議：LRS 維持量 + 矯正脫水（pyometra/dystocia 常有脫水）
類型：LRS
監測頻率：每日（術後）
穩定但需注意惡化徵兆，建議安排近期門診 (stable but monitor for deterioration, schedule near-term visit)
預後取決於胎兒成熟度差異。早產幼犬可能夭折。
Diagnostic Approach for Superfetation
Breeding history, cycle timing, vulvar discharge, mammary gland assessment
CBC, serum chemistry, progesterone level; vaginal cytology
Abdominal ultrasound for uterine and ovarian evaluation; radiography for fetal count/viability