What is the unit-rate of 129 pounds dog food for 16 dogs?

The formula for unit rate is:

$$\text{Unit rate}=\frac{\text{Total amount}}{\text{Number of items}}$$

Therefore, the unit rate of 129 pounds dog food for 16 dogs is:

$$\text{Unit rate}=\frac{129 \text{ pounds}}{16 \text{ dogs}}=\boxed{\frac{8.06 \text{ pounds}}{1 \text{ dog}}}$$