I don't think it's a matter of whether I or anyone else likes or doesn't like dogs. The fact is, we're talking about a business that I think should keep ALL of its clients in mind.
Some people simply don't like or feel comfortable around them or are very much afraid of them or are allergic or whatever. What if the dog should nip, bite, or scratch someone, as another poster mentioned? That would be a liability issue.
As much as many of us love our pets and consider them to be a part of our family, they are still animals. And if one employee or client brings in his or her dog, then that means that all employees and clients could do so.
~Who in the world am I? Ah, that's the great puzzle~ Lewis Carroll, Alice in Wonderland