I went looking for the site I used to try and find out about Holland Lops when I believed the bunny in the ad was one...
'The Holland Lop is a breed which exudes massiveness in a compact package. Weighing 3-4 pounds, Hollands are short coupled with a round head, flat face, wide body, full chest, and short lop ears that fall from a wrap-around crown. Their body-to-head ratio is 2 to 1, with the overall look reminiscent of a Bulldog. Coming in a variety of broken and solid colors, Hollands have a unique show pose of resting lightly on their front feet. Most importantly the Holland Lop has a sociable, comedic nature that is truly endearing. It is for this, that the Holland Lop attracts so many, and is considered by the fancy as the "Hallmark breed".'
That came from here:
http://www.rabbitandcavydirectory.com/Breed_Gallery/Holland_Lop.htm