ʿWe do not enter a house in which there is an image or a dog.ʿ And the dog belonging to al-Hasan was in the house.
أَنَّ جِبْرِيلَ أَتَى النَّبِيَّ ﷺ فَقَالَ إِنَّا لَا نَدْخُلُ بَيْتًا فِيهِ صُورَةٌ أَوْ كَلْبٌ وَكَانَ كَلْبٌ لِلحَسَنِ فِي الْبَيْتِ
Once Gabriel promised the Prophet (that he would visit him, but Gabriel did not come) and later on he said, "We, angels, do not enter a house which contains a picture or a dog."
وَعَدَ النَّبِيَّ ﷺ جِبْرِيلُ فَقَالَ إِنَّا لاَ نَدْخُلُ بَيْتًا فِيهِ صُورَةٌ وَلاَ كَلْبٌ
"قَال جِبْرِيلُ: إِنا لَا نَدْخُل بَيتًا فِيه كَلبٌ وَلَا تصاوير".