I like her quick sketches best - they capture the life and movement, and are so much better than a photograph if I want to get ideas for poses.
Diana Thorne did dog portraits as commissions. I did one or two of those myself, but working from photos, to make a bit of money when I was a teenager.
It's not the sort of thing which interests me these days, though I did do a dog portrait in my illustration style a couple of years ago. It was commissioned by a school where I had worked with the children, as a retirement gift for a much-loved Headteacher. I was told that his two favourite things were his little dog and golf: