<PERSON> comment to the original question is apt. Not only are prey animals adapted to avoiding a fight instinctually (generally speaking), but physically as well.
A hare that was about 5' 10" and 185 lbs would have two big front teeth, and some claws, but most of that 185 lbs would be in its massive hind legs. A rabbit does not kick as part of its fighting. And here's one reason why:
A rabbit's skeletal structure is overall much lighter compared to predators (because it is built for speed), and shatter relatively easily. Femurs sometimes break just from jumping. Fighting is not winning for a rabbit.
Its eyes are set more to the side of its head with almost 360 degrees of view, but no binocular vision -- which is real handy when you are trying to bite (or punch) something, especially a moving thing.
You can't just scale up things and get equal return for size. If you take the long, light and thin leg bones of a rabbit, and you make them even longer, and attach about 100 lbs more muscle weight to it, those bones may no longer be able to take the stress. 376
The bending stresses may be tolerable when the bone is only two inches long, but if they are going to be two feet long, then the proportions and the density have to be beefed up.
A good example is engines used before the <PERSON> Brothers; they were simply not able to output enough power to carry their own weight. Bigger engines put out more power but they weighed more too. It also ate a lot more fuel and generated a lot more heat. A tiny engine is less likely to melt itself. That same engine fifty times bigger actually might. Making things bigger increases the advantages but also increases the disadvantages.
A timber wolf, on the other hand, has every advantage. It is a sleek killing machine, not a fast grazing machine.
However, even a 5' 10" rabbit could still kill you or a wolf if it got a lucky bite in. So size alone would make it more dangerous for the wolf, but all in all the wolf is built to kill, and a rabbit is built to run. 160