When taking pix of me for blog post illustrations, Twitpic, Flickr, or desktop wallpaper, my Dad envisions an imaginary frame for pet photos. As shown here, this is me Corky the shelter dog in the lake at Fleet Peeples Dog Park near Orlando on a recent visit.
Dad used a simple point and shoot camera, specifically a Sony Cyber-shot DSC-W150, and to his credit around 2/3rds of his photos are keepers. That same camera has created all my YouTube puppy video footage, too.
Like anything, practice practice practice. You too can get great photographs of your pet using this imaginary frame for pet photos.