7:176
وَلَوْ شِئْنَا لَرَفَعْنَاه ُُ بِهَا وَلَكِنَّهُ~ُ أَخْلَدَ إِلَى الأَرْضِ وَاتَّبَعَ هَوَاه ُُ فَمَثَلُه ُُ كَمَثَلِ الْكَلْبِ إِنْ تَحْمِلْ عَلَيْهِ يَلْهَثْ أَوْ تَتْرُكْهُ يَلْهَثْ ذَلِكَ مَثَلُ الْقَوْمِ الَّذِينَ كَذَّبُوا بِآيَاتِنَا فَاقْصُصِ الْقَصَصَ لَعَلَّهُمْ يَتَفَكَّرُونَ
Wa Law Shi'nā Larafa`nāhu Bihā Wa Lakinnahu 'Akhlada 'Ilá Al-'ArĐi Wa Attaba`a Hawāhu Famathaluhu Kamathali Al-Kalbi 'In Taĥmil `Alayhi Yalhath 'Aw Tatruk/hu Yalhath Dhālika Mathalu Al-Qawmi Al-Ladhīna Kadhdhabū Bi'āyātinā Fāqşuşi Al-Qaşaşa La`allahum Yatafakkarūna 

And if We had wished, We could have raised him with it, but he stuck to the earth and he followed his desire. His example is like the dog, if you scold him he pants, and if you leave him he pants; such is the example of the people who deny Our revelations. So tell the stories, perhaps they will think.

18:18
وَتَحْسَبُهُمْ أَيْقَاظا ً وَهُمْ رُقُود ٌ وَنُقَلِّبُهُمْ ذَاتَ الْيَمِينِ وَذَاتَ الشِّمَالِ وَكَلْبُهُمْ بَاسِط ٌ ذِرَاعَيْهِ بِالْوَصِيدِ لَوِ اطَّلَعْتَ عَلَيْهِمْ لَوَلَّيْتَ مِنْهُمْ فِرَارا ً وَلَمُلِئْتَ مِنْهُمْ رُعْبا ً
Wa Taĥsabuhum 'Ayqāžāan Wa Hum Ruqūdun Wa Nuqallibuhum Dhāta Al-Yamīni Wa Dhāta Ash-Shimāli Wa Kalbuhum Bāsiţun Dhirā`ayhi Bil-Waşīdi Lawi Aţţala`ta `Alayhim Lawallayta Minhum Firārāan Wa Lamuli'ta Minhum Ru`bāan 

And you would think they are awake while they are asleep. And We turn them on the right-side and on the left-side, and their dog has his arms outstretched at the threshold. If you looked upon them you would have run away from them and you would have been filled with terror from them!

18:22
سَيَقُولُونَ ثَلاَثَة ٌ رَابِعُهُمْ كَلْبُهُمْ وَيَقُولُونَ خَمْسَة ٌ سَادِسُهُمْ كَلْبُهُمْ رَجْما ً بِالْغَيْبِ وَيَقُولُونَ سَبْعَة ٌ وَثَامِنُهُمْ كَلْبُهُمْ قُلْ رَبِّي أَعْلَمُ بِعِدَّتِهِمْ مَا يَعْلَمُهُمْ إِلاَّ قَلِيل ٌ فَلاَ تُمَارِ فِيهِمْ إِلاَّ مِرَاء ً ظَاهِرا ً وَلاَ تَسْتَفْتِ فِيهِمْ مِنْهُمْ أَحَدا ً
Sayaqūlūna Thalāthatun Rābi`uhum Kalbuhum Wa Yaqūlūna Khamsatun Sādisuhum Kalbuhum Rajmāan Bil-Ghaybi Wa Yaqūlūna Sab`atun Wa Thāminuhum Kalbuhum Qul Rabbī 'A`lamu Bi`iddatihim Mā Ya`lamuhum 'Illā Qalīlun Falā Tumāri Fīhim 'Illā Mirā'an žāhirāan Wa Lā Tastafti Fīhim Minhum 'Aĥadāan 

They will say: "Three, the fourth is their dog." And they say: "Five, the sixth is their dog," guessing at what they do not know. And they say: "Seven, and the eighth is their dog." Say: "My Lord is fully aware of their number, none know them except for a few." So do not argue regarding them except with proof, and do not seek information regarding them from anyone.