Wow they are beautiful they have brilliant bone structure for girls! They are sure well loved they look in brilliant condition, If you wish to leave them entire then thats your choice they will be at a risk of ovarium tumors (because they have overies) if they are spayed they wont so there for dont have the risk. How often does the sister drag the other? if you want to stop it put some sudo cream on her neck she wont like the taste and leave her alone.