Adopted Puppy Behavior Q

[anh164]

I have a 6 yr old goldendoodle and we just adopted a new puppy goldendoodle that is almost 1. Both are males. When the dogs lay down, the new puppy puts his mouth on the older dogs side. Doesn't bite hard, just grabs some fur in his mouth and stays there. What does this mean? Should the behavior be corrected or is it normal? Thank you for your help