It is best to choose one during early to mid puberty, so that this technique can have a great impact. First steop is to remember to always massage the chest daily to improve blood circulation and activate growth receptors. Afterwards, give your pet a good thrusting to help the body release hormones. With sufficient time and effort, her breasts will show accelerated growth, and if lucky (based on genetics and diet), will lactate without pregnancy. Remember to pump her daily so that her breasts wont by too engorged and painful for her. She wont be able to do it herself due to her small frame having insufficient strength to handle her overdeveloped breasts.