That could well be. They're not terribly small, just some sawed-off mo-fos. Kind of like the little guy on Jackass. Maybe they've been humping with the woodchucks. hmm, that could be my fault. Say I shot Mrs. Rabbit. A man rabbit's got his needs. . . . miscegenation happens.We had mostly just cottontails living wild on the farm too but they looked normal, healthy.
People do breed "dwarf" rabbits that stay small, like the rabbit version of a toy dog breed. Maybe some of those got loose and mixed with the local wild ones.