I suppose open plan has some advantages, like it is more hip (makes for great "we are a family" pictures), and the "team building" might make people less likely to leave their jobs. Just guessing - in any case there might be effects that offset the lower productivity. Otoh I was floored to read today that Amazon apparently has lots of dogs in their offices because it is supposedly good for the atmosphere, lower stres…
There is science behind it, although accommodations should be made for those who are allergic or have phobias.
"There is plenty of research to show that this isn’t just another shaggy dog tale. Studies going back to the early 1980s support the idea that dogs—and other pets—have enormous health benefits for people. Pets have been shown to lower blood pressure, improve recovery from heart disease, and even reduce rates of asthma and allergy in children who grow up with a Fido or a Frisky in the house. Pets also improve people’s psychological well-being and self-esteem."
http://www.health.harvard.edu/blog/therapy-dog-offers-stress...