This recipe calls for 1.5 ounces. This is usually the amount of a shot glass. I say usually but not always as there is no standard measurement for shot glasses.
1.5 ounces of Kahlua
1.5 ounces of vodka
1.5 ounces of cream (this can be substituted for milk or half and half)
A splash of coke.
Add the Kahlua and vodka in a shaker with ice and shake.
Pour the Kahlua and vodka into a tall glass with ice.
Add the cream and the splash of coke.
Find it online: https://thekindredway.com/test/colorado-bulldog-drink/