we have three 9 day old puppies , on giving birth to the last one coco our proud mother pulled out the puppie with its paw causing damage to the pups rear pads , mother has kept it clean and healthy looking , two days ago we noticed two small wet marks on its back thinking this is where coco had picked her up , only today we have noticed hard scabby skin we have bathed it with boiled cool salted water (not too much salt ) . what is your advice please .