I haven't seen any evidence that animals are kept away by a fire. This answer discusses that briefly. In general, wild animals in pristine backcountry areas tend to be wary of humans, simply because we're unfamiliar. Some animals, such as squirrels and bears, that live in heavily used areas can become dependent on human food, and they will then become habituated to humans. In areas like Yosemite Valley, these are animals that cruise the campgrounds nightly. They're certainly not staying away from campgrounds because there are fires.
Wolf attacks are extremely rare in Europe. A study of wolf attacks states: "Since wolves recolonised France in the late 1980's after almost a century of absence there have been no documented attacks on humans." If you get an opportunity to see a wolf in the wild, you could celebrate it as a rare, once-in-a-lifetime experience to see an animal that has been driven almost to extinction. In times and places where wolf populations are less endangered, it appears that many attacks are by rabid wolves. I doubt that there is much you can do to deter a rabid animal. Note that many different animal species carry rabies, e.g., skunks and bats.
Your most likely problems when dealing with wild animals are hassles, not attacks, and those hassles are likely to revolve around small animals and their attempts to get your food. To avoid those hassles, the most straightforward thing you can do is to take measures to prevent animals from getting access to your food, and to hide the smell of your food. For example, you can keep all your food sealed inside zip-lock bags, and you can hang your food from a tree or put it inside a hard-sided canister or a kevlar sack such as the ursack.