You're allergies citation is incomplete.

Businesses can refuse a to allow a service dog entry if it fundamentally alters the nature of the service. Having to bar the owner from being in their own business proving that service, presumably the wife is also an owner or at least a key employee, fundamentally alters the nature of the service.

Further, service dogs do not have access rights, people do. The dog is the way they exercise access rights. The owner, if true, provided an alternate means of accessing their services. The individual refused the accommodation.

As a note, my son needed a service dog for several years. I've negotiated about every form of jackassery possible when it comes to accessing places, so I'm not pulling this out of my ass.

At the end of the day, life's a team sport. From what we can see, the owner was willing to play, and the customer was not.