With the size difference I would be concerned too. My two 1 year old pups are the same weight and size for the most part so they are evenly matched but can get rough sometimes. I use a squirt bottle of water and say no when they get rough and squirt them. It has work well for us. It startles them without loud noise or hurting them.
__________________  Taylor  My babies Joey, Penny , Ollie & Dixie   Callie Mae, you will forever be in my heart! |