Snowy (character) he is able to understand human language, and communicates with speech bubbles. His verbal responses to various situations include jokes, expressions of fright, and pleas to Tintin to exercise caution. In the early albums he takes an interest in mechanics and geography; in "Tintin in the Congo", he makes biblical references. As a dog, he also sniffs, tracks, chases, and bites. The character of Snowy evolved through the course of the Tintin series. In early works he exchanges dialog with other characters, including animals, and provides a running commentary on the situation. His character then became affected by the introduction
Tintin (character) and has prompted a few to devote their careers to his study. General Charles de Gaulle "considered Tintin his only international rival". Hergé biographer Pierre Assouline noted that "Tintin had a prehistory", being influenced by a variety of sources that Hergé had encountered throughout his life. Hergé noted that during his early schooling in the midst of World War I, when German armies occupied Belgium, he had drawn pictures in the margins of his school workbooks of an unnamed young man battling (a slang term for the Germans). He later commented that these drawings depicted a brave and adventurous character