(CBS) — Major Diggs Brown spent more than 30 years in the Army. When he returned from Afghanistan, he suffered from PTSD, so for two-and-a-half years, his service dog Arthur has been by his side.

“He does a lot of things. He wakes me up from nightmares when I have them. When I have anxiety attacks, he calms me down. He saved my life and I’m even off the drugs,” said Major Diggs.

But when he was in Chicago for the weekend and tried to sit down for breakfast at Cochon Volant, 100 West Monroe St., he was met with a surprising response.

“When my service dog and I walked in, the hostess took us to the table, and the young lady named Hannah, she said you can’t have a dog in the restaurant,” Brown said. “I kept my cool and I said you know it’s the American Disabilities Act. This is my service dog, he can go wherever I go, it’s the law. So I was seated, placed my order then Hannah came over again and said I have to leave. I said it’s my service dog and she said I don’t care, you need to leave, we don’t have dogs in the restaurant. I could go to the Department of Justice with this if we continue down this path.”