lolz…I have a 3 pound mini rex who makes bb’s that are more like shooter marbles if he eats the right hay, out-pooing my 9 pound lionhead/palomino’s best efforts. ^_^
The only poos I would watch out for are the ones that are the size of apple seeds or misshapen and infrequent, because a bunny isn’t eating right or may have stasis or a blockage, or strung together with fur during shedding. Both indicate either a trip to the vet or better hay intake and a good brushing for your bun.
As far as size of a rabbit is concerned, this has to do more with genealogy than waste size. I have a 4 pound Holland lop who can make some of the smallest droppings I’ve ever seen even during times of health. He’s just never been a big pooper. But he does follow the basic size guidelines for the breed.
Himalayans do tend to run on the smaller side in size I think. However, I believe that Himalayans and Californians can look much alike when young, and the Californian is a larger bun full grown.