Prey Rabbit is definitely one of THE hardest prey to catch for a wolf. Especially an older wolf, because of their quickness. Rabbits make a small snack for a wolf. Wolves will normally hunt rabbit when there is really nothing else to hunt, because they are so hard to catch, and use up alot of energy.
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Mice are very small and some-what easy to catch. Mice alot of the times scurry across a wolf's clearig, and if spotted, will maybe be hunted down, or just played with. Wolves like to play with the mice, and afterwards, possably kill it to eat. Mice aren't very filling at all, but when food is scarce, sometimes thats all you have to eat.
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Wolves do go fishing, not often, but they LOVE to swim and play in the water as well as hunt in it. The skill of catching fish is a great one at that. Wolves hunt for fish whenever the creeks/streams/and rivers are not frozen. Mostly in the spring.
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Squirrel is another smaller form of food. When food is scarce then they will hunt squirrel. Squirrel is a bit hard to catch, seeing how they spend alot of time in tree's and such. But when they come down to scour for food, that is the best time to hunt them.
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Moose, are difficult to catch, because of there hooves, massive weight, and they move in herd. Yet, the young, weak, injured, and old will stand out the most to a wolf. What wolves normally do while hunting such a large animal, is keep the huge herd moving. Thus the injured, weak, sick, young will fall out of the herd and the wolves have a "chance" at catching the prey.
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Like moose, they weight is massive, they have very tough and heavy hooves, which means danger for a wolf. Depending on where the territory of a wolf ranges from, moose is more likely to be seen then elk, in most cases (but not all).
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Deer is one of the most hunted prey within the forest, like moose and elk, they have hooves and powerful hind legs which could some major damage to a wolf. They hunt the weak, sick, injured, and old does/bucks. As well as fawns (Baby Deer)
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Depending on where a wolf lives and how far its territory ranges, if bison are in the area, they will be hunted like moose or any other big game. Bison are extremely heavy in weight and have powerful hind legs as well. They run in herds.