Well I just had a random idea of this XD

1. Feed him a prey to get his body to absorb the nutrients from the prey to make milk~

2. After digesting his prey but one thing is that don't leave him without milking him for too long otherwise he would be having a sore and heavy udder to move around with~!

3. You can either milk him by hand or by machine either way works but just feed him some ramen to keep him slightly distracted though~