Is there any alternative sound except Farting to mark back of the Dragon in the audio game

I try to use Unity3D for making a mobile audio game in the form of a fairy tale. But I faced the problem with 3D sound model of the Monster \Dragon. The most clear way to mark the back part of the Dragon (in the darkness) is to use farting sound. But in some countries such details are not acceptable. I have tried to use some mechanical sounds for showing the long tail motion. But I failed to find free sound sample that sounds well. In this clip: heavy breathing marks “ the Head“, “heart beats“ mark