To convert pounds to ounces, you can use the conversion factor that 1 pound is equal to 16 ounces.
To find the weight of the puppy in ounces, multiply the weight in pounds by 16:
\[ 12.3 , \text{pounds} \times 16 , \text{ounces/pound} = 196.8 , \text{ounces} \]
Therefore, the puppy weighs 196.8 ounces.