I answered "sometimes" because I allow the people in my department to bring their pet when there is no other possibility but in general in our company it's not allowed. However I think if a dog is here once a month or so because his mom is a single mom (of a dog and 4 cats) and in general there is day care for the dog and the dog behaves well than there is no reason to say no.
We all here would enjoy very much if we could have a kitty or 2. They would like to work with computers, papers and pictures, I am sure, but........