1) What is the interpretation of a dog barking next to the mosque throughout the entire duration of the Adhan and then falling silent after it ends? 2) How authentic is the Hadith: "There will come a day upon my Ummah when mosques are full and hearts are empty"?

It has been authentically reported from the Prophet, may Allah’s prayers and peace be upon him, that Satan flees upon hearing the call to prayer and emits flatulence. The howling of dogs may be due to their seeing devils, or because the black dog is a devil. Devils can take on different forms, including the form of a black dog and a black cat. Blackness gathers satanic forces. As for the hadith about the embellishment of mosques and the ruin of hearts, it is very weak.