Until the mid 1800's, most dogs lived off of table scraps from their owners. An American, named James Spratt, gained the idea of creating a dog treat while watching dogs nibble on old biscuits in a shipyard. His dog treat went into production and eventually his company joined General Mills. Canned horse meat was sold by the Ken-L-Ration brand after WWI as a way of utilizing deceased horses. By the end of WWII, pet food sales had grown to $200 million. Companies realized the possibility of making a profit from by-products.Today, most people feed their dogs with dog food. Some professional breeders and canine lovers dislike dog food because they believe it has additives which could be unhealthy.