English toy spaniels remained popular enough during the 18th century to be featured frequently in literature and in art. On Rover, a Lady's Spaniel, Jonathan Swift's satire of Ambrose Philips's poem to the daughter of the Lord Lieutenant, describes the features of an English toy, specifying a 'forehead large and high' among other physical characteristics of the breeds. Toy spaniels and Pugs were featured in both group portraits and satirical works by William Hogarth. Toy spaniels were still popular with the upper classes as ladies' dogs, despite the introduction of the Pug; both Thomas Gainsborough's portrait of Queen Charlotte from 1781 and George Romney's 1782 Lady Hamilton as Nature feature toy spaniels with their mistresses. The toy spaniels of this century weighed as little as 5 pounds (2.3 kg), although they were thought to be the dog breed most prone to becoming overweight, or 'fattened'.