His theological thinking was influenced by William Wallace SJ, a former Anglican priest who had become a Roman Catholic following his study of Hinduism.
Dandoy was, above all, very close to the missiology of Pierre Charles, who encouraged an approach that was both respectful of the religions and open to the cultures of the East.
After some years of teaching theology at Kurseong (1917–1922), Dandoy returned to Kolkata where he passed the rest of his life.
In 1932 he published L'ontologie du Vedanta: Essai sur l'acosmisme de l'Advaita; Jacques Maritain and Olivier Lacombe both contributed commentaries at the end of the work.
While being rector of a house of formation, he devoted himself totally to research and wrote articles and books in the field of the encounter between Catholic theology and Hinduism.