I can't help myself: I love it when dogs tilt their heads, trying to comprehend what you're blathering about or what you're doing in their face. It's like they think you've lost your mind but still can't help themselves but look at the spectacle that is you.
Both Sadie and Katie do the head-tilt. I had both girls out on the front porch the other night at dusk to take some photos. Both tolerated my repeated attempts to get something decent in the nice but failing light. Amazingly, Katie was in no hurry to go back inside as she is often wont to do. So I tried photographing her from different angles: some below her, some at eye-level, some above her. She was a good sport through it all. I finally said, "cookie", and she started tilting her head to her left, then to her right.
I was trying to be careful about the background here. I didn't want too much of what was behind her to be a distraction. While focusing on her eyes I set the 50mm lens aperture at f/2 to blur both the foreground (see how her nose is a little fuzzy?) and background. After importing into Lightroom I dodged her eyes and left ear to lighten them, sharpened the area around her eyes, and finally added a slight vignette.
(Shot with the Nikon D300 using the 50mm f/1.8 lens; aperture-priority; aperture set at f/2, camera chose 1/320 second; ISO 400; center-weighted metering; +0.3 exposure compensation; normal JPG.)