Be concerned about any bitch whose sole function in life appears to be the production of puppies. (doggytoggery.com)
Dogs whose sole function is to provide comfort or emotional support are known as therapy dogs. (sitstay.com)
It's possible no one will — at least, not enough to spend $ 290 on a device whose sole function amounts to just one small feature on the tablet or smartphone that many already own. (slate.com)