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If you have any hope of the flock surviving then you will have to take control of things. Open the door, do whatever it takes to keep it open during the day. Put food and treats in the coop only. Once they are in close the door and make them stay up for a couple of weeks.
Having Guineas is not a hands off endeavor, successful breeders or flock managers do not leave them to do on their own. They are trained to return to the coop each evening. Treats like millet help train them to where home is.
Depending on where your dogs hang out and where your Guineas hang out could explain the ticks. Our dogs stay near the coops and house where they rarely ever bring back a tick. If they go out in to the wind rows chances are they will come back with one or two. But then the Guineas don't spend a lot of time in the wind rows.