فَلَحِقْنَ وَاعْتَكَرَتْ لَهَا مَدْرِيَّةٌ كَالسَّمْهَرِيَّةِ حَدُّهَا وَتَمَامُهَا
The dogs caught up; she wheeled toward them with a horn whose sharp point and length resembled a fine lance.
Fa-laḥiqna means the dogs caught her; iʿtakarat depicts her turning to face them. Madriyyah is a horn; samharīyyah a straight, fine lance.
The comparison stresses both sharpness and length. The cow, earlier helpless in grief, now becomes an active defender.