If Thai kind.. nah, never seen leaf drop or dormancy, everbearing, never stop growing.
I did have 1 mulberry tree, perhaps this Thai dwarf you have. It never got taller than 5' after 2 years, and fruits were small and and sour from getting too much sun. I figured it was just stunted. Hardy as hell, dug it out and left it, and it just ignored that. Gave it to a friend to plant in a pot. This tree only fruited 2-3 times per year.
From my mother tree that I liked too cuttings and planted everywhere. All cuttings showed the same vigorous growth, 20' tall within 2 years.