Dutch photographer Maarten Wetsema (b. 1966) has some of the most fetching canine portraits I've come across. I've been particularly taken with his series on Daan and Jacob (left and right, above), in which the two dogs are photographed on a variety of seating elements against a seamless background. The deadpan of Daan's gaze is priceless, while Jacob looks to be the most cuddly dog on earth.
Wetsema is represented by Van Kranendonk Gallery in The Hague, The Netherlands.