[citation][nom]f-14[/nom]actually yes, yes they can, and they do for all sorts of reason, even seeing eye dogs, people with guns and other oddities etc.it's the right to refuse service.[/citation]
In the US you can't deny service to someone with a disability unless they are causing a problem, so no you can't refuse to serve someone with a seeing eye dog. It is against the law to deny service based on protected classes such as “race, color, religion, national origin, disability or sexual orientation.”