I think this term started in the enterprise software space, and was probably coined because subconsciously, enterprise software sales and management people real

I think this term started in the enterprise software space, and was probably coined because subconsciously, enterprise software sales and management people realized that their products were on par with dog food - ground up mystery stuff that is just barely edible except for animals that will practically eat anything. But package it up in nice marketing and sales efforts, and away we go! This is coming from someone who spent WAY too much time in the Enterprise software space.