Unfortunately, I do not have any answers. I would like to tack on
another question. How does this affect animals, such as dogs, which
also have super sniffers?

From the literature, not at all.

According to what I've read, the garlic is pretty much without odor in no
time -- I'd wager even to dogs, although it probably takes a tad longer than
for humans I'd imagine.

Give the info at mosquitobarrier.com a read through -- they talk about what
amounts to most of the questions I would expect are commonly asked; how is
it applied (sprayer/fogger), what's in it (all organic), how concentrated
(2oz per gallon of water), how much does it cover (something like an acre
for a quart), how to store it, is it safe for pets & kids (yes), does it
hold up to rain (yes as long as it's been applied for something like 24
hours), will my yard stink (not after about 15 minutes), and so forth.

They also claim it can take care of grasshoppers as well but they don't go
into much detail on what OTHER insects it might harm/drive away, except to
say ladybugs aren't affected and butterflies are fine as long as it isn't
sprayed directly on them. From the way they talk, it sounds as if this
stuff will actually kill mosquitos it comes in direct contact with (i.e.,
during spraying) which is an added plus IMHO. It's also supposed to be
effective against fleas, ticks, aphids, gnats and similar bugs.

I did a search on "garlic repellent mosquito" on Yahoo and got a decent
number of results to look through but I'm still looking for someone who has
actually used the stuff before I buy it -- at 30 bucks a quart (after
shipping) it ain't cheap.

James