I think one of the first questions would be, what are the dog breeds? It is important to note that some dogs have a higher prey drive than others. Just because a dog was comfortable with a hamster doesn’t mean it will be the same with a rabbit. If and when you decide to introduce the two of them I would go EXTREMELY slow. Have the dog on a leash and or contained as well as the bunny (in your arms). Or, better yet, put them in a seperate space with a baby gate or something similar between them. I wouldn’t try and introduce between the cage because that can be extremely stressful to your bun, do the introductions in a space your bunny can get away if he feels uncomfortable. If the dog reacts at all remove her immediately! If she doesn’t react praise her. Animals are’t stupid and some can and do understand the difference between a pet and a wild animal (not saying all do). Bunnys typically get along with cats very well and I have heard a lot of success stories about introing dogs as well. Personally, I would never trust a dog or cat with my rabbit unsupervised. Even if they didn’t purpously attack the animal they can sometimes cause harm from playing too rough. I let a little cori puppy play with my dog at work and they do very well together but sometimes the puppy gets a little too rough and we seperate them. Over time the puppy has learned acceptable behavior during itneractions becuase if he doesnt he looses his friend!