Anything which the person sets up in front of him will qualify as a sutrah, even if it is only the end of his bed. Sabrah ibn Mu’abid reports that the Messenger of Allah said: “When one of you p, he should make a partition for his salah, even if it is an arrow.” This is related by Ahmad and by al-Hakim who said it is sahih according to the criteria of Muslim. Al-Haithami observes: “Ahmad’s narrators are sound.”
Abu Hurairah relates that the Prophet said: “When one of you prays, he should place something in front of him. If he cannot find anything, he should prop up his staff [in front of him]. If he does not have a staff, he should draw a line [on the ground in front of him] then nothing that passes in front of him will harm him.” This is related by Ahmad and Abu Dawud and Ibn Hibban. The later classifies it sahih as did Ahmad and Ibn al-Madini. Al-Baihaqi says: “There is no problem with that hadith regarding that ruling, Allah willing.”
It is related that the Prophet sallallahu alehi wasallam prayed toward a column in his mosque, toward a tree, toward a bed upon which ‘Aishah was lying, and toward his riding animal, and toward his saddle, and so on.
Talhah says: “We used to pray and the animals would pass in front of us. We mentioned that to the Prophet and he said: “If anything the size of a saddle is in front of you, nothing that passes beyond it would harm you.” This is related by Ahmad, Muslim, Abu Dawud, Ibn Majah, and at-Tirmizhi who calls it hasan sahih.