over the years I have developed quite a severe allergy to animal dander, eg dogs, cats, horses
sad really as I always loved having all of these pets as a child and like animals/see the value they add to peoples lives in general
but now even 15 minutes in a closed space with a dog or cat will have me wheezing and tight chest, streaming eyes and nose. I take antihistamines but that's not practical all the time and has side effects for me so I don't take them routinely unless expecting exposure (the other daily drug that damped my responses successfully was withdrawn due to side effects)
even peoples clothes with animal dander on them can set me off, and once staying in apparently pet free rental accommodation where the last visitors had sneaked their dog in: absolutely awful experience, had to sleep in the car
I try and modify my life to avoid dogs and its easy to decide on looking into a cafe or pub whether I can stay there, eg with no animals in but I would be really upset if there were dogs (other than essential service dogs) in food and clothes shops routinely
Yes, service dogs will set off my allergies; but there tend to be few of them, they are incredibly well behaved and I would not ask a person requiring a service dog to get out and about to compromise their needs for my medical issues: only that a dog owner might compromise their wishes to have their pet with them at all times for my physical comfort in not having my allergies triggered by exposure to dogs in confined spaces. And don't get me started on people saying 'don't worry, hes just a big softy' as their dog jumps up at me - I'm not scared of him, I just don't want him near me'