how often should i groom my 12 week old staffy bitch . shes moulting i think also has dry skin vet said put butter or evening primrose oil in her food is thi right as i dont want her getting to fat

A brush every day is a good way of training and bonding with your puppy.
:)

also ive noticed after weeing a small amount of discharge she apears healthy . just wondered is this a normal female puppy thing

You could try a rubber hound glove to get rid of loose hair and give a lovely shine (as well as a massage)