Just very coincidentally, POIS could be more or less corelative to the beginning of my POIS. Also in my youth though, I was exposed in my early teens to poodles that my mother had. Around which I hadn't yet developed any POIS, until much (35 yrs) later.
Poodles ar not very alergenic though.
If dogs where a trigger, you;' expect to see much more POIS in the world. I wonder if the Dr. is speaking with "tongue in cheek"?