Ma'mar (may Allah have mercy on him) said: I heard in the explanation of this hadith that the ill omen of a woman is her being barren, the ill omen of a horse is its not being used in jihad, and the ill omen of a house is a bad neighbour.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسامة / 16527