how to get rid of the lice of a puppy?

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Our dog gave birth into 5 cute puppies. Right now, they are six weeks old. But the problem is when they have learned to walk and stroll around, they get lice from our big dogs who goes to play outside the house. Every time I check there are like little white flakes in their body, and they keep on scratching all the time. The puppies are so cute, and I want them not to feel irritated all the time. I know there is a way that i could prevent the lice from eating the skin of my little puppies. But I don't know what would be the best shampoo or the best way of treating it.I would appreciate if there's someone who experience of treating a case like this.Thank you so much!