I don't think the regulations are specifically aimed at dog owners, but animals in general. Why should dogs have preference to cats, horses, budgies, snakes, crocodiles etc? A mate in Nigeria had a pet croc on a lead which he used to display to all who were interested. It loved to take a piece out of any dog that dared to approach. However, I do remember from the John Wayne days that the horses were evidently always tethered outside the Gold Nugget Saloon.
Seriously, All animals if they are fur covered are natural breeding grounds for bacteria and pests. It is the nature of the beast as some would say. So if food is on display then there is inevitably some transfer from one host to a 'feast' for the bugs. One good shake and ......... Whoopee! The issue of guide dogs is indeed an anomaly that is a result of one law meeting another, namely food hygiene and animals versus human rights of blind people. However, I suspect that the majority of blind people would, if the situation was explained to them, happily allow their guide dog to be held in an adjacent area while they had their meal/drinks whatever. I know that the majority of people would assist an impaired person without question to ensure that they enjoyed themselves as much as everyone else. I also believe that guide dog owners are usually the ones who are most vocal about ensuring that they do not receive any untoward advantages.
At the end of the day it is up to individual premise owners to make a decision, but I suspect the majority will follow caution to pre-empt any possible law suit. That is the way we have allowed our society to operate, and so must accept it. I do agree that there are some children to whom I would most dearly like similar laws to apply, or possibly their charming parents, but that is another subject for discussion.