Have you ever had them in your yard before? If you've never had them in spring and summer, be careful to watch for nests when mowing. I didn't know what a rabbit nest looked like (kind of like dirt with some weeds bunched up...they nest underground). I thought the dog was digging.
The vibration or sound must have spooked them and the all ran up out of the nest. I let go of the bar as soon as I saw one, but 1 didn't make it. That was enough, I cried for days and couldn't get that image out of my head. Now I mow waaaaayyyy around any dirt patch in my yard. They were tiny too, about the size of a Twinkie.
So if you can't get rid of them, just be mindful. Do you have any bushes, brush or thatch/vine areas? They like to nest in that in the winter.