If the odor seems to appear from outside sources such as odors from digging in the dirt that the dog brings in, you simply need to keep the dog bathed and try to keep him or her from digging. As some said here if its hot they dig to cool off, So perhaps more shade or simple kitty pool in which they can dunk themselves. Also providing lots of cold water. We run a hose on a very low trickle all day in a large bucket when dog is outside to keep him cool. If he or she has a dog house, the bedding needs to be addressed. Older blankets, straw etc can become foul when the dog brings in outside dirt and moisture. Keeping the dog house vented and clean helps a lot.

Bathing the dog also has its limitations as well. Some dogs just cannot have frequent washings as it drys out their coat. So a good brushing comes into play here as well. But if you must dip and dunk your dog to keep odors under control, use high quality dog shampoos and rinse the dog well.

To rid the room of the smell, Natures Miracle sold at most pet stores and larger shopping centers works great. This will rid any urine smells in short order.

If the dog is limited to a smaller area of the yard, they can pick up odors from their droppings and urine as well. So the larger the run area the better.

I am not a big advocate of putting dogs in runs or on chains, but if space is limited and this needs to occur for the dogs safety etc. You need to be really diligent on keeping those areas clean. A spray every day of Lestoil and water to disinfect the area is suggested. This not only stops odors from blowing around the yard, but keeps down flies and insects that often feed on dog by products. Just be sure that the area is dry before returning the dog to it.