As a disabled person who has been in similar situations, I find it easier to just leave the location. I then call the store owner and ask him/her what his policy is regarding the situation. When he/she agrees with what happened I point out that denying access to a disabled person with or without a companion animal is a violation of the ADA law. I usually then suggest an immediate fix for the situation. I then go on to suggest sensitivity training for his/hers employees. If the owner still seems to believe they are right I inform him/her that a complaint will be made to the Department of Justice with details of the incident. I then do just that. The DOJ investigates by usually having someone who is disabled go to the business and if any violation exist the owner will be cited. The owner may have to shut down while making the necessary renovations etc. They may have to go to court as well and could face prison and or fines as well. Some businesses have been shut down permanently. Ignorance of the law is no excuse.