i give my dogs the monthly pill (I use Interceptor) which prevents most worms, including heartworm and whipworm. HeartGuard is another product but it does not prevent whipworm, which is a problem in my area. Most cheap over the counter stuff you buydoes NOT give much protection against worms. They usually only target the most common types of intestinal parasites and, IMHO, do so quite poorly.

Remember that hunting/working dogs earn a living too. Be sure to feed them aQUALITY dry dog foodfrom a known a reputable company. Purina, Hills (Science Diet), Eukanubaor Diamond are great places to start.

The food and the medicine may be a bit expensive, but if you plan on hunting your dog hard and often, it will definitely save you hassles in the long run.