Xo_Danielle_xO

I know that dogs show dominance by humping each other...I have a 3 month old Chihuahua and a 5 year old Chihuahua. My 5 year old has always been the dominant one when I was living at home with my parents. Now I am moved out, and I had gotten a new puppy(the 3 month old). Now it seems that my 5 year old isn't the dominant one anymore...My puppy is. The puppy is showing dominance by humping my 5 year old. My puppy isn't neutered yet, but my 5 year old is. I AM planning on neutering the puppy. And I do know that it has nothing to do with the puppy not being neutered. There isn't any aggressive issues between the two..They play non stop all day with each other...Should I let him do it so that they can determine where they stand in the pecking order, or do I get them to stop since it is somewhat undesirable behavior?