Which of the following ingredients is NOT part of a Colorado Bulldog?

A Colorado Bulldog is a variation of the White Russian cocktail, incorporating vodka, Kahlua (a coffee liqueur), cream, and typically a splash of cola. The primary ingredients work together to create a creamy, sweet flavor profile that's both decadent and enjoyable, with the cola providing a unique twist that differentiates it from the more traditional White Russian.

Tequila, on the other hand, is not an ingredient in a Colorado Bulldog. While tequila is a popular spirit used in many cocktails, its flavor profile does not align with the creamy, coffee-mixed character that defines a Colorado Bulldog. Therefore, including tequila would drastically change the essence of the drink and is not part of its traditional formulation.