 In the 17th century , toy spaniels began to feature in paintings by Dutch artists such as Caspar <unk> and Peter Paul Rubens . Spanish artists , including Juan de Valdés Leal and Diego Velázquez , also depicted them ; in the Spanish works , the dogs were tricolour , black and white or entirely white . French naturalist Georges @-@ Louis Leclerc , Comte de Buffon would later describe these types of dogs as crosses between spaniels and Pugs . 
