Thank you everyone, I suspected it was a dominance thing but wanted to see what everyone had to say about it and if I was on the right track.

I have a nine week old Jatsu puppy, Today I got her a new toy, It is a soft Plushy Ball a little bigger than her. She instantly took to it and played with it for hours, when my husband noticed her humping it. What does this mean? does anyone know?

I am also greatly interested in this subject, as I have a 9 week old Jatsu who has a hernia. I am told that it is breed specific not maternal or paternal. Meaning that parents who do not have the problem can still have puppies that do and vise versa...