I just moved from a five acre ranch in Tijeras NM to Meadville PA in a housing development due to divorce. I have an almost three year old female spayed GS. On the ranch it was Foxxies job to guard the property. She was very good at keeping the coyotes out of the perimeter. She is very gentle and loving and works hard. I must also mentioned that I fostered dogs while in Tijeras and Foxxie got along with all of them.
BUT since moving to this development she barks at every other dog she sees and lunges towards the door and pulls on the leash especially when the neighbors Golden comes out to play. The whole neighborhood is terrified of her due to this new bahaviour. I have a 9 week old GS puppy and she gets along fine with her though the puppy is crated and tethered to me when out. I try to walk off Foxxies excess energy but I am confused by this sudden change in her attitude. She is not this way towards humans at all...
I can only figure she sees other dogs as like coyotes invading her territory. Any thoughts or suggestions would be welcome.
I did buy the Dominance DVD but have not been able to sit through the whole thing due to scheduling.

I really feel for Foxxie (and you!) -- her whole world has been turned around by this extreme change in habitat <:-(

I'll be interested to read what some of the pro trainers suggest, but I see this as a "de-programming" situation, and I think you have a good read on Foxxie seeing other dogs as being like coyotes that it's her JOB to scare away, so I hate the thought of harsh corrections right off the bat (but maybe I'm being too soft-hearted about that?) -- Anyway, I think it's more of a re-training issue than a dominance-aggression problem (JMO)

I think Candi might be right! It's possible Foxxie is barking at strange canines since it does not see them as part of her pack, such as the coyotes at the ranch. Best thing to do is get her more socialized with the city folk and their dogs.

Don't forget she may also be affected by the loss of what she may see as the other members of her pack. I'm not an expert but just a thought. My older dog always acts weird when he senses a "break-up" between me and a beau even if he isn't all that attached to them.

Yes she has had some big adjustments. We have had to move 4 times in the last 6 mos and one time it was my two toddlers, two cats, and two shepherds in a motor home! She is used to running without a leash and just playing, but because of her lunging and barking I do not dare let her off leash in this development. It was the only place I could find on short notice that would allow pets. I am less worried now thank-you. Maybe within the next year I can get my own place and have some acreage to fence in for the dogs to be off leash. :-)