The Messenger of Allah ﷺ said: “When anyone of you prostrates let him be balanced in prostration, and not spread his arms as a dog does.”  

رَسُولُ اللَّهِ ﷺ إِذَا سَجَدَ أَحَدُكُمْ فَلْيَعْتَدِلْ وَلاَ يَفْتَرِشْ ذِرَاعَيْهِ افْتِرَاشَ الْكَلْبِ  

“Be balanced in prostration; none of you should prostrate with his arms spread out like a dog.”  

أَنَّ النَّبِيَّ ﷺ قَالَ اعْتَدِلُوا فِي السُّجُودِ وَلاَ يَسْجُدْ أَحَدُكُمْ وَهُوَ بَاسِطٌ ذِرَاعَيْهِ كَالْكَلْبِ