There Is NO Such Thing As A Micro Pig. Did you know that there is no such thing as a ‘MicroPig”. Apparently, the new trend is to have a micro pig, a small cute pig the size of a cat. The sad consequence is that many people buy small pigs thinking that they will stay that size. Eventually this results in unhappy owners that have a huge animal that they can’t look after that completely takes over their lives and their home.