she's a 3 year old weimaraner/labrador mix and everytime the gardner comes to our house to do our lawn, she goes crazy and jumps on the sofa to the window and barks, we try telling her to stop, but she just looks at us and continues to bark at the window.

then when they go in the backyard, she goes to the window to see the backyard and barks like a raging dog! how can we stop her from barking so much? (we take her inside, but she still barks)
she only does this to the gardeners..