"The Messenger of Allah said: 'Whoever keeps a dog which he does not need for farming or livestock, one Qirt will be deducted from his (good) deeds each day.' It was said to him: 'did you hear this from the Messenger of Allah He said: 'Yes, by the Lord of this Masjid."' (Using translation from Nasāʾī 4285)
وَقَالَ قَالَ رَسُولُ اللهِ ﷺ «مَنِ اقْتَنَى كَلْبًا لَا يُغْنِي عَنْهُ زَرْعًا وَلَا ضَرْعًا نَقَصَ مِنْ عَمَلِهِ كُلَّ يَوْمٍ قِيرَاطٌ» قُلْتُ يَا سُفْيَانُ أَنْتَ سَمِعْتَ هَذَا مِنْ رَسُولِ اللهِ ﷺ؟ قَالَ «نَعَمْ وَرَبِّ هَذَا الْمَسْجِدِ»