The novena to St. Dominic starts tomorrow: http://catholicharboroffaithandmorals.com/Dominic%20Prayers.html#Novena
See also: Novena To Our Holy Father St. Dominic: July 26 - August 3 (https://breviariumsop.blogspot.com/2019/07/novena-to-our-holy-father-st-dominic.html) from Brevarium S.O.P.
He starts it one day earlier.
Are novenas supposed to end on the day of or the day before?
I had thought novenas are supposed to end the day before the feast, but for some reason Catholic Harbor of Faith and Morals website has novenas ending on the feast.