Do dogs know how old another dog is? And so, do they interact differently?
I've noticed that Milo (6 month old Kelpie) plays really rough with my friends 5 month old dalmation (bigger than him in size). But he's a lot less rough with my friends 3 month old mini fox terrier x (which is about 1/6 Milo's size).
Today when he played with my cousin's 14 year old dog which was about 1/4 Milo's size, I couldn't tell if Milo was just being gentle or being harrassed and scared. He would touch and lick the older dog gently, and always be the one chased. The other dog's tail was always wagging, though. Is this just how a puppy plays with a senior dog?