Dogs roaming in neighborhood,is my dog attracting them?

I usally don't see loose dogs in my neighborhood.Twice this week I have seen two dogs roaming around.I believe these dogs were male,my dog is a female.I guess it's time to get my dog spayed,even tho I haven't seen her in heat.I've had males ever since I lived here.Do you think that my dog attarcts them here? She's only 4 1/2 months old.She may be big enough,but she's not old enough to send out any signals,at least I think.