my OH is asthmatic very allegic to cats and some dogs. We found he is fine with dark haired dogs but seems to struggle with white/pale coats for some bizarre reason
For this reason we have two black boys and he is fine. Did however have a blue roan pup, that had to be returned within 24 hours
as she triggered a massive attack.
If you do go to a breed show which is a good idea, bear in mind that for an asthmatic it could be overwhelming, my OH would struggle with too many dogs in one room but is fine with just a couple. Better see if anyone lives near enough to 'borrow' a cocker for a day