To find out how much money Dominic will spend on making 12 loaves of bread, we can multiply the cost of making one loaf by the number of loaves he plans to make:
\[ \text{Total cost} = \text{Cost per loaf} \times \text{Number of loaves} \]
Substituting in the values:
\[ \text{Total cost} = 1.58 \times 12 \]
Now, calculating that:
\[ 1.58 \times 12 = 18.96 \]
Therefore, Dominic will spend $18.96 to make 12 loaves of bread.