That's about right. I'm not sure if the fever kills off the pathogens so much as it just doesn't allow them to flourish, but the idea is basically the same. Low-grade fevers should be watched, and immune support should be given. Juliette recommends fasting for as long as the temperature remains above 102.6 degrees, or at the most giving honey-water or fresh grape, apple or pomegranite juice. (Fasting allows the body to use its resources toward fighting the illness, instead of toward digestion.) Knowing the reason for the fever is also important, especially if it becomes high (above 103.5) or if it lingers for several days.
Most dogs with a fever will seek out cool places - tile floors, for example - to help lower it themselves. (Or, warm places, if the fever is one that gives them the chills.) They also often pant for no reason, and the insides of their ears are hot and red.