1- Try to avoid using flash when taking the photo if at all possible. This can cause redeye and dark shadows resulting in a poor quality photograph. The best shots are taken outdoors, and in natural light. If it is sunny then it is better to find a shady spot and keep the light source behind you.2- Have your pet sitting, then get down to their eye level before attempting to take a photo. Have some help from another person to get your dogs attention with a toy or treat, try toget your dog to look slightly upwards and to one side of you.
3- Be patient and make it enjoyable for you and your dog
