I don't know what to try with Dora, she is always scratching, constantly, even in the middle of the night she will wake up to scratch

. We have try shampoos after shampoos, conditioners, I have change her food, I ask the Vet and he ask if she had flees...I'm always looking on her hair and I did notice that her skin is kinda red all over, I don't know if that is the normal color or are they supposed to be more pink or what.