We have two dogs, Milla and Lucy.
Lucy gets startled easily and when she is scared can be prone to responding aggressively. She is not highly food motivated, especially when she is agitated.
Milla wants to play with humans more than other dogs, and she generally tries to avoid confrontation, but she will respond in kind if attacked. She is highly food motivated and highly energetic.
Lucy and Milla used to play chase often in the yard, but there was an occurrence where Lucy was startled by something falling while near Milla. The situation quickly escalated and became a fight.
We broke them apart, but now Lucy shakes whenever they are both out at the same time. We've been keeping careful eyes on both of their responses and controlling interactions pretty carefully.
We want them to both be able and willing to play again. It was good for both of them to have a friend to play with. But with Milla being so human-centric and Lucy being so scared, the chemistry just isn't there.
Any ideas of what we can do to help this situation to encourage them to become friendly with one another again?
Lucy is a small, muscular, 25 lb (11 kg) picanese mix, about 4 years old, and Milla is a lean and tall, muscular, 45 lbs (20 kg), a bit over 2 years old.