Yes, there can be parasites in raw meat. But if you are getting meaty bones and carcasses from places fit for human consumption, the parasite factor is negligible. Most parasites are a non-issue and can be safely dealt with by your dog if it is healthy.
The parasite issue is something than non-raw folk use as a scare tactic, telling you that your dog is going to die if it eats raw meat because it will get a weird parasite. They neglect to tell you the very low incidence of these parasites in meat deemed safe for human consumption; nor do they tell you the most "deadly" of these parasites come from things like infected sheep placentas or stillborn calves. Simple solution—do not feed those things to your dog. If the dog looks like it has parasites, simply get a stool sample or blood sample taken. A dog can be wormed holistically or allopathically (the chemical insecticide dewormers). But generally speaking, if your dog has a healthy immune system, it can deal with the parasites before they even get a chance to establish themselves. Parasites hate a very healthy host.
Freezing meat can help kill many parasites (such as the parasite present in salmon that CAN cause a deadly disease in dogs; freezing fresh raw salmon, steelhead, trout, and other salmonids for at least 24 hours before feeding effectively disposes of the parasite. Cooked salmon does not carry the parasite.). As long as one exercises caution in obtaining their meat, parasites are a non-issue. If feeding fresh salmonids or wild game, it is recommended that the meat be deep frozen for at least 24 hours before feeding for salmonids and one month for wild game.
Do not give in to the bacteria and parasite scare tactics. The suggestion of cooking your dog's food is actually quite harmful! It is the cooked food that causes problems with the dog's digestive system and that can result in the nutritional deficiencies vets claim they see from raw diets (in reality, most of these nutritional deficiencies arise primarily from home-cooked diets, since cooking destroys many valuable nutrients.). This issue is dealt with in further detail in the Cooked Food myth.