The Prophet ﷺ said "If a house fly falls in the drink of anyone of you, he should dip it (in the drink) and take it out, for one of its wings has a disease and the other has the cure for the disease."  

سَمِعْتُ أَبَا هُرَيْرَةَ ؓ يَقُولُ قَالَ النَّبِيُّ ﷺ إِذَا وَقَعَ الذُّبَابُ فِي شَرَابِ أَحَدِكُمْ فَلْيَغْمِسْهُ ثُمَّ لِيَنْزِعْهُ فَإِنَّ فِي إِحْدَى جَنَاحَيْهِ دَاءً وَالأُخْرَى شِفَاءً  

Messenger of Allah ﷺ said, "A prostitute was forgiven by Allah, because, passing by a panting dog near a well and seeing that the dog was about to die of thirst, she took off her shoe, and tying it with her head-cover she drew out some water for it. So, Allah forgave her because of that."  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ غُفِرَ لاِمْرَأَةٍ مُومِسَةٍ مَرَّتْ بِكَلْبٍ عَلَى رَأْسِ رَكِيٍّ يَلْهَثُ قَالَ كَادَ يَقْتُلُهُ الْعَطَشُ فَنَزَعَتْ خُفَّهَا فَأَوْثَقَتْهُ بِخِمَارِهَا فَنَزَعَتْ لَهُ مِنَ الْمَاءِ فَغُفِرَ لَهَا بِذَلِكَ  

The Prophet ﷺ said, "Angels do not enter a house that has either a dog or a picture in it."  

حَفِظْتُهُ مِنَ الزُّهْرِيِّ كَمَا أَنَّكَ هَا هُنَا أَخْبَرَنِي عُبَيْدُ اللَّهِ عَنِ ابْنِ عَبَّاسٍ عَنْ أَبِي طَلْحَةَ ؓ عَنِ النَّبِيِّ ﷺ قَالَ لاَ تَدْخُلُ الْمَلاَئِكَةُ بَيْتًا فِيهِ كَلْبٌ وَلاَ صُورَةٌ  

Messenger of Allah ﷺ ordered that the dogs should be killed.  

أَنَّ رَسُولَ اللَّهِ ﷺ أَمَرَ بِقَتْلِ الْكِلاَبِ  

Messenger of Allah ﷺ said, "If somebody keeps a dog, he loses one Qirat (of the reward) of his good deeds everyday, except if he keeps it for the purpose of agriculture or for the protection of livestock. "  

قَالَ قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَمْسَكَ كَلْبًا يَنْقُصْ مِنْ عَمَلِهِ كُلَّ يَوْمٍ قِيرَاطٌ إِلاَّ كَلْبَ حَرْثٍ أَوْ كَلْبَ مَاشِيَةٍ  

That he heard Messenger of Allah ﷺ saying, "If somebody keeps a dog that is neither used for farm work nor for guarding the livestock, he will lose one Qirat (of the reward) of his good deeds everyday."  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنِ اقْتَنَى كَلْبًا لاَ يُغْنِي عَنْهُ زَرْعًا وَلاَ ضَرْعًا نَقَصَ مِنْ عَمَلِهِ كُلَّ يَوْمٍ قِيرَاطٌ فَقَالَ السَّائِبُ أَنْتَ سَمِعْتَ هَذَا مِنْ رَسُولِ اللَّهِ ﷺ قَالَ إِيْ وَرَبِّ هَذِهِ الْقِبْلَةِ