You raise some interesting points, Karlin. Sometimes (usually after they have been playing, and Holly wants to settle on the sofa for a while) Holly will snap and even nip at Chloe when Chloe comes bouncing round. I've noticed it more when Holly has been beside me and Chloe wants up. Incidentally, Chloe also tries the same thing in the reverse situation! I don't normally intervene (if Holly does something that even makes Chloe yelp, she stops immediately) but in that situation I sometimes do- purely because their relative positions would make it easy for Holly to inadvertently scratch Chloe's eye. Am I right?
How fixed does a routine have to be? Chloe doesn't have a very good 'stay' yet, so getting her to stay put while feeding Holly first, for example, is a non-starter. I get round this by feeding them separately in the morning, and then they happily share a plate of kibble and beans in the evening. No aggression there whatsoever from either, even though there's food in the equation.
Holly - 7years
Amber- 3 years