Barking Dog Lithograph 1982

What does the barking dog mean in Haring's Barking Dog Lithograph 1982?

The Barking Dog has become one of Haring's most iconic symbols, first appearing in his New York subway drawing series from 1980–85. It emerged as a symbol of oppression and aggression, acting as a warning to the viewer of the abuses of power that pervade everyday life in America and beyond.