Hello all We adopted a pup cocker spaniel and brought her home when she was only 1 month. My sheltie, MeiLi, accepted her, divided her things with cocker no problem, doesnt mind that the cocker steals her food but when she interacts with her we see some worry things. I am not sure why all this mouthing around pup's neck. I took a video of her doing that in a controlled situation bcs...when they are free hell starts. How to stop that? Here is the video: close attention in the ending. https://www.youtube.com/watch?v=EoMB3LMlDY0 Thank you all for your help!