Where does this saying come from? I know what it means. This is my first GQ post, and I think I covered all the bases. I googled it (got lots of hits, zero origin info), checked Cecil’s archives and searched the SDMB. If there are steps I missed, please feel free to inform me. Thank you.
Whilst camping in the desert with a camel as your conveyance, if the camel is to stick his nose through the tent flap that is a very bad thing indeed, because very shortly thereafter there will be much more camel inside the tent than outside it and, when one is also in the tent, this is rumored to be unpleasant in the extreme.
A Google search finds various cites claiming it’s an old Arab proverb - “Once the camel’s nose is in the tent, the rest is sure to follow” - but no clear origin.
I heard it was because of sandstorms. Soft-hearted camel riders would want to provide shelter for the camel’s head so it could breathe, leading to another truism that no good deed goes unpunished. Of course, I have no info to address the actual OP.