Abu Dawud

Benefits and Issues:
➊ If a dog puts its mouth into a vessel, whatever is in it (in the form of food or drink) should be thrown away, and the vessel should be washed seven or eight times, and it is necessary to scrub it once with earth.
➋ Some students of Sayyiduna Abu Hurairah radi Allahu anhu omitted the mention of scrubbing with earth, but this does not necessitate that it is not present in the original narration. It is possible that they acted with brevity. Meanwhile, Muhammad ibn Sirin, Abu Ayyub al-Sakhtiyani, Hasan al-Basri, and Abu Rafi‘ rahimahullah have mentioned scrubbing with earth. And “the addition of a trustworthy narrator is accepted...” According to this principle, the narration of Sayyiduna Abdullah ibn Mughaffal regarding the eighth time is acceptable.
➌ Modern research supports that only earth is truly effective in killing the dog’s germs.
➍ Whether the dog is a hunting dog or not, its saliva is impure (najis). There appears to be a specific exception in the matter of hunting.
➎ The general command to kill dogs has been abrogated so that their species is not completely destroyed.
➏ Keeping a dog for hunting and protection is permissible.

Hadith Commentary:
Benefits and Issues:
From this hadith, it is understood that the original reason for shortening the prayer (qasr) was the fear of battle with the enemy. However, Allah, out of His grace upon the Ummah, made it general, so that even if there is no fear or danger of any kind during travel, one may still perform qasr. Therefore:
﴿لَيْسَ عَلَيْكُمْ جُنَاحٌ﷢﴾ (“There is no sin upon you...”) and the use of the word “charity” (sadaqah) is evidence that this is not obligatory (fard), but since it is a bounty and grace from Allah, its requirement is that a person should individually and personally perform the shortened prayer (qasr). However, if one is praying behind a resident (muqim) imam, then one should perform the full prayer.