This ad shows contrast by using color and by using different texts.  The gray coloring in the background contrasts agaisnt the white in the background.  Repetition in this ad  includes the use of the same type of text, and the use of the same elements, the dog.  I thought the alignment of this ad was centered, because the bigger dog's head and front paws made a line that went through the center of the page.  Proximity is shown in this ad by putting the words us and them under the bigger and smaller dogs, and by putting the contact information, and company information by themselves.  This ad shows contrast in text, because when the ad say us and them it uses one type of text, then for its logo it uses another type of text.