My husband has gotten into the habit of saying get her to our 14 week old doberman, Tito when he is playing with our 9 yr old Bullmastiff, Pepper. I worry that this is going to lead to problems? He thinks that is it harmless, but I worry nontheless. Is it okay? The dogs plays wonderful together and our bullmastiff is really good with Tito, but I know that when he grows up he could hurt her, as she is old. I have never owned a doberman before, only bullmastiffs so I am learning with Tito. He is a ball of energy, where my Pepper is laid back and very lazy. He has really been good for her, as she has even started to play with balls and other toys. Cute to see, I just want to make sure that their relationship stays positive.....any advice would be helpful. Thank you....