A person or company creates the sense of a category to me, two things which should be treated as equivalents. There is a cat or dog making noise outside implies that you believe it's definitely one of those two things.
A person or a company feels softer I think, with less of a feeling of "the group consists of these things*, more like "here are two possible examples of what I'm talking about". It's a very subtle difference!
- Would you like a coffee or tea? (these are your two options, want one of them?)
- Would you like a coffee or a tea? (I'm offering these two things, but maybe I have others if you ask!)