As a needlework enthusiast and a bunny lover, I’ve done many searches and the best selection is on this site:
http://www.abcstitch.com/subjects_php/subjects.php
I’ve ordered from this company before and was pleased with the service.
Unfortunately, most cross-stitch/embroidery patterns you will come across are either cartoony, Easter Bunny types or country bunnies wearing clothes. There are some realistic rabbit designs out there but not in abundance. As for specific breeds, I haven’t come across anything. If you are comfortable enough as a cross-sticher you could always change the colours to make it resemble a certain breed.
I’ve started making my own embroidery designs because what I want just isn’t out there. I’d love to get a computer program to make my own cross-stitch charts too. There are companies online where you can send a photo and they will chart it for you so you can cross-stitch your own rabbits.