The Messenger of Allah ﷺ said: Observe moderation in prostration, and let none of you stretch out his forearms (on the ground) like a dog. (Using translation from Muslim 493a)
قَالَ رَسُولُ اللهِ ﷺ وَحَدَّثَنَا يَحْيَى عَنْ شُعْبَةَ حَدَّثَنَا قَتَادَةُ عَنْ أَنَسٍ عَنِ النَّبِيِّ ﷺ قَالَ اعْتَدِلُوا فِي السُّجُودِ وَلَا يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ انْبِسَاطَ الْكَلْبِ