My dog barks at people when she's out on her walk.?

Hi everyone, I have a year old boxer with plenty of energy to spare. I walk her 2 to 3 times a day and lately (the past month) she has started barking at people when we walk by their yards or when they pass on the road. How do I handle this? Right now I am making her sit - stay while the people walk past us and I... show more Hi everyone,
I have a year old boxer with plenty of energy to spare. I walk her 2 to 3 times a day and lately (the past month) she has started barking at people when we walk by their yards or when they pass on the road. How do I handle this? Right now I am making her sit - stay while the people walk past us and I try to keep her at a heel when we pass their properties. Anyone know why this would be happening? and am I doing the right thing to stop it?

Thanks!
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