Just to add my two cents, I agree that just because someone works at PetSmart doesn't mean they know their stuff, my old GSD, Cory, and I went into one once, and the gal at the register gushed "Oh what a beautiful dog! What kind is it?" I was feeling cheeky and mischievous, so I mentioned, "Oh, she's a Brazilian Squirrelhound." She looked impressed and said, "Wow, I've never heard of that breed before!". So without missing a beat I went on, "Not surprising, they're very rare in the U.S., right now there are only about 12 stateside, I had her imported, I'm hoping to breed her to further the U.S. population." This was probably around 1998, 1999 or so, I was a bit more of a smart@$$ in my youth!
I agree you should do some classes and see how she does around other dogs both on-and-off leash, and with knowledgeable trainers present to help you.
If there are signs of aggression in certain circumstances, they can also help you figure out the main motivation behind it, and then help you to work with it and around it. (Is it fear-based/ resource guarding/ protective of handler when on a leash/ etc...)
Each dog is very individual, too, my Singer-mix, Maiyou, for example, speaks with a weird "dialect" as it were, and sometimes has miscommunications with other dogs, even though she was raised in a multi-dog household. She doesn't play-bow, but leaps out and "shoves" with both forepaws as play invitation. She "smiles" when she's feeling submissive, which some people who don't know her, misconstrue as a snarl, but if she turns her face pointedly away from another dog and growls, That's when I need to watch out and tell her "Leave it!" Followed by a command to "come" or "go" with a directive finger-point.
The more time you spend getting to know her, the more adept you will become at reading and predicting her little quirks and idosyncracies. (*lol* or "idiot-syncracies" as I like to call some of my critters little unique neuroses,
It sounds like she's in good hands with a loving family!
(And my guys are allowed on the furniture, too, for safety reasons, my dogs have always been trained to wait when a door is opened, be it house or car, until directed out with a wave of the hand, but I don't make them let me go first.)


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