He earned his living as a construction worker and attended evening classes at the business school, first in the structural engineering, later in the decorative department.
In 1923, Hug moved to Berlin and attended evening classes in the private school of Arthur Lewin-Funcke, and at Lessing University.
He studied with local teachers Käthe Kollwitz and Max Liebermann, who supported him with letters of recommendation, but was also influenced by Karl Walser and Lovis Corinth.
With his partner Amrey Balsiger (1909-1999), the daughter of Menton Moser, Hug first went to Arles for some time in 1927, where he worked with Max Hunziker.
After the marriage in the same year, they took up residence in winter in Zürich and in summer in Greifenstein-Staad near Rorschach, an old farmhouse with a large garden and a view of Lake Constance.