This hadeeth comes under the following chapter: MODERATION IN PROSTRATION, PLACING THE PALMS ON THE EARTH (GROUND) AND KEEPING AWAY ELBOWS FROM THE SIDES AND THE BELLY FROM THE THIGHS WHILE PROSTRATING
This hadith has been narrated by Shu'ba with the same chain of transmitters. And in the hidith transmitted by Ibn Ja'far (the words are):" None of you should stretch out his forearms like the stretching out of a dog."