[murgindrag]

Allergies.

You end up with a large segment of the population who sneezes a little bit, which is sort of annoying but sort of okay.

You end up with a small segment of the population with asthma attacks, anaphylaxis, and other life-threatening conditions.

Universal use of dogs would mean that there would be people who simple cannot travel, ever, anywhere beyond driving distance.

There's a small war between extremist dog-owners (the ones who believe dogs are people too, and sneak them into all sorts of places dogs aren't allowed as "activism") and people with severe allergies.

[sidlls]

I have never heard of any life-threatening allergic reaction to any drug or bomb sniffing dog. Has that actually happened? If so...how, when, and where?

[woofie11]

Asthma attacks are not uncommon in response to dog dander. Those can be life-threatening, but can be managed with albuterol. 30 seconds with Google will turn up countless documented instances.

Anaphylaxis is a very rare response to animal dander, but there have been a few documented instances:

https://www.petful.com/misc/can-pet-allergies-kill-me/

What's amazing is the number of dog owners who don't believe in dog allergies, or who believe their dogs are hypoallergenic due to fur/hair (dander is in the saliva).

[dopamean]

There's no chance that people with pet allergies are the reason bomb sniffing dogs aren't more widely used.