I recently went hrough this when I brought home an abandoned American Bulldog puppy. I had already introduced my other two older dogs to rabbits, but this was a puppy so I was glad to have the opportunity to raise her with the rabbits. To start, I put my puppy in the crate (also for crate training, you should highly consider this when training a puppy, it makes everything easier!) and let my rabbits come up and sniff her through the bars. I chose to do this during one of her puppy naps so she wouldn’t scare them at all.
After having them approach her for awhile while she was contained, I decided to put them in an xpen and let her walk around from the outside of the pen and watch them. Whenever she barked or went into the play bow or showed any form of excitement, I would remove her. I would also work on training her “down” so that she learned to get on the ground when the buns were around. At this point she was still very small, only about 20 lbs or so, so I began to feel comfortable letting her in the same area as the rabbits when she was showing non-threatening interest, while keeping her in a “down stay”. She was so small then, that my mini lop would actually charge her and honk sometimes! He never did that with my other dogs but thought this little one was a formidable opponent! Now I trust her with them, the buns jump all over her and she just accepts it, haha. The only thing I have to worry about is when she uses her nose to push them to the side, because she loves eating their poops! (the vet tells me this isn’t desirabe obviously, but won’t harm the dog). Now she just plops down in front of their area and watches them when she’s bored, like bunny tv!
Good luck with your introductions!
Here is Honey and bridge bun Tuna