Since prehistoric times, humans have crafted small-scale representations of humans, gods and animals, also known as figurines. Like with many other art forms, the techniques used for figurine production were advanced by the Ancient Greeks and Romans, with both cultures manufacturing terracotta and bronze figurines of deities and animals for religious purposes; in Roman cult worship, dogs were considered to have healing and protective attributes, resulting in the trade of figurines depicting man's best friend. From the 18th century onwards, intricately-detailed figurines were produced by porcelain factories across Europe, including notable manufacturers Meissen, Sèvres and Capodimonte. Decorative animal figurines were also common during this period, with realistic representations as well as playful versions of animals performing human activities in dress available on today's collectors' market. For many years, porcelain manufacturers Royal Doulton, Lladró and Royal Copenhagen have produced popular dog figurines, which have become collectors' items.