Born in Germany to a Lezgin family from Azerbaijan, Renat was eligible to play for both countries. He played for the Azerbaijani U-16 team during the summer of 2014. He was later invited to the German U-16 where he scored 4 goals in 6 games. On 9 September 2015, Dadashov debuted for German U-17 team and played 15 matches with 13 goals during the next year. He reached the semifinals of the 2016 UEFA European Under-17 Championship with the German team.