Thanks for all the replies and concern. I did cave and email my vet. She said there is a lot of upper respiratory infection around right now (her office is a 5-minute walk from my house, so very local). But she also said there has been no canine influenza in Toronto, which is a big relief. Shala has not been vaccinated for influenza - as, since it has not been here, it is not recommended - nor for bordatella, as we don't do daycare or anything that requires it.
Oh geeze - I can't believe the other owner allowed that. Well, yes I can. Same thing happened to me several years ago - but it was kennel cough. Sure enough mine got it. I guess you have to wonder if they had their dog to the vet and was actually diagnosed with something? Or are they just guessing? Maybe just call your Vet, leave the question with the receptionist, and let them know you don't need the answer immediately. I think I would just keep an eye on her, and perhaps limit exposure to other dogs for the next week?
I wondered, too, if the owner was just guessing. The dog didn't LOOK sick - no runny eyes or nose - so very possible.
It isn't a guarantee she'll get sick. But she probably is a carrier if anything.
Just keep an eye on her for the next week or two - that's all.
Fwiw - my guys have been exposed to KC at shows and at the places I've trained at. I had both Jacks and Bertie in a crate for an hour before somebody told me that somebody the prior day had used that crate with her dogs (who were all very sick with KC). Anyway - the guys never got sick even with that much exposure. And we don't do bordatella.
That's my worry - even if she doesn't get sick, I don't want her to pass it on to the dogs I train with or the dogs in her daily dogwalking group. We went tracking this morning and we have field tomorrow, so I'm just warning everyone and letting them decide if they want me to keep her isolated (it's not at all difficult to do - the only time they mix is when we let them stretch their legs and run around before we get started, and then at the end, same thing. But I can just take her in a different direction).
I'm going to watch her closely and just hope her strong, youngish body will fight it off. I've never had a dog catch a cold so I just have no compass for how serious it can be. At least my vet eased my mind by confirming no flu in this region!