There is no way in he## I would go to any food establishment that had any animal other than service animals in it. Gross. Then again we don't have any pets in the house and I know most do so we're probably more picky about that.
I have heard the 80/20 rule too and my dd, being in the minority of people with life threatening food allergies definitely gets the short end of that stick. But we appreciate the places we can go so much that I would spend more there than bother with places that are not 'allergy friendly'. Not to mention the death thing.