A truffle hog is any domestic pig used for locating and extracting the fruit bodies of the fungi known as truffles from temperate forests in Europe and North America. Pigs have a great sense of smell, and are able to identify truffles from as deep as three feet underground. It is thought that the natural sex hormones of the male pig are similar to the smell of the truffles, and, also, pigs have a natural affinity for rooting in the earth for food. They are trained to hunt truffles by walking on a leash through suitable groves with a keeper.
The use of the pig to hunt truffles is said to date back to the Roman Empire, but the first well-documented use comes from the Italian Renaissance writer and gastronomist, Bartolomeo Platina, in the 15th century. Later references to truffle pigs include John Ray in the 17th century.
In 1875, a truffle hog could cost up to 200 francs. A skilled truffler could more than make up for this investment from the high price of truffles on the gourmet food market. Today dogs (known as "truffle hounds") are commonly used for gathering truffles instead of truffle hogs because hogs have been known to eat too many truffles in the field. However, traditionalists argue that the swine have more sensitive noses and their particular taste for truffles leads to a more devoted beast. It is frequent for the hog to be a family pet of the truffler.
In Italy, the use of pigs to hunt for truffles has been prohibited since 1985 because the animals caused damage to the mycelia of truffles when they were digging, reducing the production rate for a number of years.
- Sullivan, Walter (March 24, 1982). "Truffles: Why Pigs Can Sniff Them Out". The New York Times.
- Hall, Ian R.; Gordon Brown; Alessandra Zambonelli (2007). Taming the truffle: the history, lore, and science of the ultimate mushroom. Timber Press. ISBN 978-0-88192-860-0.
- Mammilia, their various forms and habits (1875) - Page 174 Google Books
- "Snuffling for truffles in Åland" Helsingin Sanomat, International ed.