If I was 100% sure it wasn't a service animal, I'd call the front desk. Sorry. I love my dogs, but that's what kennels are for.
I never Rat someone out unless it is unsafe. I would only tell if the animal seemed harmful. Plus it might be a service dog so that is what I would assume and mind my own.
I would call it in. If it's a service animal, then there's no problem.
The dog didn't have a little jacket on, and I can't imagine a dog that size as a service animal. I don't like to be a tattletale, but I wouldn't want my dues to increase because they have to recarpet the room. I mean where do they take the dog to do it's business when pets are forbidden?
I would call it in. If it's a service animal, then there's no problem.