[5] A member of AV Suomi club in Velsen training under Laurent Meuwly,[1] Dobber competed at his first senior national event at the 2017 Dutch Athletics Championships and placed fourth in the 400 m. His first national podium finish came at the 2018 Dutch Athletics Championships, where he was runner-up to Tony van Diepen.

In his senior international debut he placed fifth in the B-final with the Netherlands 4 × 400 metres relay quartet, alongside Terrence Agard, Liemarvin Bonevacia, and van Diepen.

He also improved his best time to 45.64 seconds, placing fourth at the Golden Gala 2020 Diamond League meeting on that outing.

[4] As part of a strong Dutch contingent at the 2021 European Athletics Indoor Championships, he placed fifth in the 400 m final while his teammates van Diepen and Bonevacia won medals.

The three combined for the 4 × 400 metres relay final with Ramsey Angela to take the gold medals with a new Dutch national record of the 3:06.06 minutes.