The Hornets snapped up the midfielder from Chelsea for £5m.
“I got asked yesterday what do you think has been one of the best signings of the window, and I think Chalobah is,” Dowling told talkSPORT.
“£5 million at his age, and his experience, albeit not a lot at Chelsea but he’s had a lot on loan, is fantastic.
“He has come through the system with Italy and trained for a season with Conte, he’s been around a group who has won the league.
“He hasn’t come in with an attitude of ‘I’ve come from Chelsea‘. In fairness to Scott Duxbury, we wanted the boy, and we wanted it done today. From our point of view, it was good business and timing, and Scott wouldn’t let it go.”