it not an easy question for me as none of mine came to me as babies, chelsea was done at around 4years then dora about 3yrs arthur was 2.5years sooty(mums rabbit) was done at 9years old, coco done at age 6years, and kitty was done at 6years (via a rescue) in terms of foster bunnies the baby wildie bracken my last foster was done at around 7months we dont know her real age so went by weight,