What kind of dog is she? Is she going into her first heat or could she be? If that's it, once this is over you should have her spayed. You don't have to worry about it anymore, don't have to worry about accidental pregnancy (and it's risks), and she'll be healthier and live longer. Do NOT let her around intact males, take her for walks or anything in public, or even in the back yard alone until at least ten days or so after she stops bleeding (or the swelling goes away in case this one is 'silent'). Those boys will come from anywhere and everywhere. Just be sure that is the reason and it's not something else. Good Luck to you.
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