Simplify the following text for a Grade 5 native English-speaking person.
Original: Hogarth loved animals , picturing himself with his pug in a self-portrait , and marking the graves of his dogs and birds at his home in Chiswick .
Simplified: When he painted a portrait of himself , he included his pug in the picture . He also marked the graves of his dogs and birds at his home in Chiswick .