if im right frontluine doesnt kill the fleas it stops them breeding so they die off that way i might be wrong , if puppy is getting them from out side that needs to be treated coz he will keep picking them up and bringing them indoors
good luck
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 No kind action ever stops with itself. One kind action leads to another. Good example is followed. A single act of kindness throws out roots in all directions, and the roots spring up and make new trees. The greatest work that kindness does to others is that it makes them kind themselves.
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