Perhaps not to the point but thought I'd share anyway.
Some years ago, as an adult (around 60 years old),
I went to a dog show.
This was in a very large room in a convention center,
with hundreds (thousands?) of dogs being groomed, brushed,
and prepared for showing in a ring.
I walked around looking at the various breeds
for more than an hour . . . maybe close to two hours.
No drips, no sniffles, no itchy eyes or throat.
If any of those symptoms would have occurred,
I would have taken an antihistamine
or would have left, or both, depending on the severity
of the symptoms and/or my degree of tiredness.
So, there I am, walking, admiring, enjoying.
Suddenly, w/immediate onset, no gradual build-up . . . .
SNEEZING, ITCHY, WHEEZING.
It was as if someone had flipped a switch.
I looked around and saw that I had reached the part of the room
that had COCKER SPANIELS. I had never known that I was
especially sensitive to cocker spaniels.
I was so pleased that I had already seen most of the other breeds
before I got to that part of the hall. And since then, I know I need
to avoid cocker spaniels.