First, get down closer to the flower's level. A photo will be more interesting if you're level with the plant than towering above it.
Next, have your dog come running over to see what you're looking at.
Adjust your camera's setting. Try a couple test photos. Make sure your black and white dog messes up the white balance and exposure settings.
Have your dog lay down out of the shot and focus on the flower again. Have another dog run over to see what all the commotion's about. Make sure your first dog jumps up from her totally reliable down-stay to bossily shove the second dog away from the interesting object you keep staring at.
Finally get both dogs in down stay, take a few damned photos, realize it's overcast and the lighting sucks anyway and give up.