For variety class entries, the pictures should show the dog in any pose appropriate for the class title. For conformation entries, the extra pictures would be well used to show the dog moving , or with the mouth wide open to display the dentition . Make sure that the dog isn't obscured by objects, people, blankets or clothing. Color pictures are definitely to be preferred over black and white ones. Pay attention to the background, and make sure it contrasts with the color of your dog's coat.
Green grass is a good background to choose for any dog.
When you enter dog in the show, you will be given an entry number, and full details on how to submit your pictures. Please do not send any images before you receive your entry number. I am interested in entering your dog show, however, I do not have a digitized picture of my dog. Full details are given below . Giving a URL I already have pictures of my dog on the web.