Absolutely not!
However.. as we ourselves get paid for the work and efforts we do, there's no reason our dogs shouldn't get compensated for wanted behaviour.
That said, there are many ways that we reward ourselves and others when we do something we're happy about. Simply feeling accomplished is a reward, but while we're working on shaping a wanted behaviour in a dog, especially a puppy, we can use treats, and sometimes even their kibble (which they will be getting on a daily, anyway) to reinforce desired actions.
Just as well, incorporating food into daily activities and exercises can and will make a healthier, more responsive, fulfilled, and obedient pooch!