[Heartxxxxx]

How do I stop my 2 year old female Micro teacup Yorkie, from, I am not quite sure how to put this...Humping...her 5 month old sister, also a micro teacup yorkie. Roxie the 2 year old is 3 pounds, Lexi, the 5 month old is 2.2 pounds.
Neither of them has been spade.
Someone said this is natural, but Lexi doesn't like it and goes to bite Roxie.