I'm a little late to this thread, but this is one thing that gets a strong reaction from me. I have dogs who do tend to bark at visitors sometimes, and I fuss at them/put them in other rooms if necessary. That said, my friends know that if they come to my house, I'm not going to keep my dogs locked away all day just so they can be comfortable. For me, it's their house, too. I do have certain friends who do not like to be around dogs, and I try to keep that in mind when they're over, but at the same time, I would not have them over for prolonged periods of time. I guess what I'm saying is there is a happy medium. Like many others have said, if you really are uncomfortable around that person's pets, don't go to their home, especially if you've asked them to do something and they won't. But my dogs' needs come first. Grown-up adults can make their own choices and take care of themselves, so that's what I expect when I hold up my end of the deal.