Art redefined

While I was searching for pictures of mini pigs [pigs that will stay tiny forever thanks to their genetics] on Google, I found this adorable article about these mini pigs who paint. They accidentally got into some craft paint one day and the owners thought it was really cute so now they are given paint on purpose and they "make art" to sell for charity. 

Their art was said to be reminiscent of Jackson Pollack. It's an adorable concept but I still don't know what to think about this type of "art". Should it be considered art if it's not made with intention? Can pigs have intentions of making art?