Answer: Rabbits are very difficult to deter. A pet dog or cat is usually a good deterrent or you might try some of the commercially available repellent sprays applied as a perimeter barrier. Unfortunately, your best and most reliable defense is a fence. To be honest, I would also suspect that the spots on your lawn might be caused as much by dogs chasing the rabbits' trail and marking their territory as by the bunnies themselves, so a fence might be helpful in more ways than one.
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