Born in 1903, Dovator came from a
Belarusian Jewish
peasant family. In 1922, he was elected to be Secretary of the Komsomol Committee of Khotino village. He joined the Red Army in 1924 and went on to become an officer after graduating from cavalry school and a military academy. In 1926, he attended Borisoglebsk-Leningrad Cavalry Commanders School, graduating in 1929 to become a platoon commander in the 27th Cavalry Regiment,
5th Cavalry Division. In October 1933, he was posted with the 1st Cavalry Regiment,
1st Cavalry Division, as a commissar. From May 1935 to May 1936, Colonel Dovator was commissar of the Independent Reconnaissance Battalion of the
93rd Rifle Division. He attended
Frunze Military Academy in 1939, and during the early months of the war, Dovator was with the Western Front Headquarters.{{Cite book|title = Soviet Cavalry Operations During The Second World War: The Genesis Of The Operational Manoeuvre Group|publisher = Pen & Sword Military|date = 2019-10-16|isbn = 978-1526743022 ==Operation Barbarossa==