Mr. Chartwell by Rebecca Hunt? Let’s start with Mr. Chartwell. He is a black Labrador, six-foot-seven standing in his hind legs. He speaks English and only appears to the two main characters: Winston Churchill (you remember him) and Esther Hammerhaus (librarian and secretary at the House of Commons Library). This a fantasy novel about depression, as personified by Mr. Chartwell.

A very British novel about two peoples’ struggles with depression without explicitly mentioning depression. I found the talking, invisible dog confusing.

For my expanded report: https://1book42day.blogspot.com/2019/06/mr-chartwell-by-rebecca-hunt.html
Check out https://amazon.com/shop/influencer-20171115075 for book recommendations.