I have two female robo dwarf hamsters. I"ve had them for about 3 months now. They were born together. I hear them squeaking sometimes and I know it's them fighting. Today I noticed that both of them have sores/scratches near their little tails. It's got me worried. I don't know what I should do. I don;t know if it will pass or if it was one bad fight. But the little bit of blood I saw got me really scared. What should I do?