question: If every picture has 3 dogs in it.
#1 return dogs 
#2 return pictures 
#3 return number of  #1 for each  #2 
#4 return #2 where  #3 is equal to  3 
#5 return number of  #2 
#6 return number of  #4 
#7 return if  #5 is equal to  #6