In the context of categorical data, we want to identify a characteristic that can be used to classify dogs into distinct groups. Among the options provided:
- Number of teeth and amount of food per day are quantitative measures and would not be considered categorical data.
- Age is also a quantitative measure, though it might represent categories (e.g., puppy, adult, senior) in some contexts, it is not inherently categorical by nature.
- Color is a categorical characteristic, as dogs can be classified into different colors such as black, brown, white, etc.
Therefore, the suitable option for Kyle to add as another example of categorical data is color.