Born and raised in Wangaratta, Victoria, Dockendorff moved to Melbourne to work for Marchants Soft Drinks and play football, firstly for amateur clubs Middle Park and South Yarra CYMS before moving to Victorian Football Association side Sandringham.
[3] Wearing guernsey number 32, Dockendorff made his VFL debut for Richmond in Round 10, 1932, against Collingwood at Victoria Park.
[4] This was his only senior match for the year but returned in 1933 until an accidental knee to the back from Collingwood's Albert Collier in Round 15 left him in severe pain.
[5] Dockendorff enlisted in the Second Australian Imperial Force on 4 October 1942 and was posted to the Unit Stores Accounts Section, Victorian Detachment.
Additionally, Sid's uncle Bob Dockendorff was a policeman on duty at the station that Kelly was taken to after the shootout at Glenrowan.