I wonder if the management knew he had them. Did you think to tell them? If not, and it happens again, I would. I would think only service animals would be allowed in, just like any other place of business.

Hats off you saying something though, even if he didn't listen. A lot of people would have said, "Oh it's wrong but not my place to say anything." Hopefully he won't be so careless in the future.. Maybe something you said sank it at some point.