I don’t think dogs should be allowed in restaurants though, regardless of training. The problem is people will say their dog is trained to an expert level, but there’s nothing to actually prove that.
There are other instances of people bringing in potentially unwanted things into restaurants that are generally allowed. Take children for example - poorly raised children can raise hell and ruin a restaurant experience for everyone else, but children are usually allowed, with enforcement actions happening after unacceptable behavior has been shown.
I think a similar policy would be appropriate for animals in restaurants. A well-behaved dog, that goes to rest under the table without bothering anyone during the visit, should not be a problem, while an uncontrolled dog that bothers other guests, tries to steal food or uses the floor as a bathroom should be taken action against.
On the topic of offices - are dogs left unsupervised for the entire work day in the cases where they cannot be brought in? I’m asking because that’s extremely cruel and in fact illegal where I live - dogs must by law not be left unattended for more than 6 hours.
I understand how bad dogs can be a problem in offices, but my experience of dog-friendly offices have been nothing but positive - the presence of a well-trained dog generally just brings up everyone’s spirit, and during focused work, the dog rests under the desk and does not bother anyone.