I would first introduce them by placing the puppy in an x-pen, wire dog crate or carrier and let Casper come up to the puppy to investigate. It is true that dogs that are very young do tend to get too exuberant and excited when introduced to a rabbit which is a bit more fragile than a tennis ball or chew toy they are used to. But, as with any animal this may not be the case, so start out safe and judge how your dog is going to behave and do not let them have unsupervised time together. It is receommended by the HRS that the dog be trained and respond to voice commands before your dog is allowed free run with the rabbit. There are some good articles on introducing fido into the rabbit family here:
http://www.rabbit.org/journal/1/dogs.html
Scroll down to “House Rabbits and Other Animals”
http://www.rabbit.org/care/living-with-a-house-rabbit.html
Personally, I would keep them separated by a baby gate so they can get used to each other and no nipping between the two can happen and then after your pup has had some formal training and responds to voice commands, start giving them some supervised time together little by little in increments until you feel that the gate can be taken down. As for behavior of the rabbit, Mimz can tell you about Mimzy and Bogart her dog. She had a bit of trouble from her spunky Mimzy climbing on and peeing on Bogart (dominance) so the issues can come from either side. A puppy nose is just as delicate as a rabbit nose and either can nip.