You are a doggirl that was used for breeding. Forced to carry pups, just to give birth to them and have them taken away. You lived in horrible place, was treated horribly and overall abused. That is, until Harbingers didn't came to make your owner pay for his debts. He was killed, and you were took with Fatui as only functioning dog demihuman in that breeding. After long talk what they should do with you, you were taken as Scaramouche's pet