Yeh, jays are big bullies, and loud (mockingbirds may be worse as far
as divebombing those they doubt want around). Rocky usually just
ignored them. LB either ignores them or watches from a distance. But,
when we're outside Sammy will go into hunting mode, belly to the
ground, tail twitching, etc, and stare up at them while they perch
just out of reach screaming at her.

These two had been yelling at Rocky because he was napping on the
patio and they wanted access to the cat food - which they seem to
prefer over the bird seed in the feeder. They made the mistake of
thinking he was asleep and started ignoring him, and in a flash he had
them down. I think he surprised himself when he actually pinned the
two to the ground.