Jabberwalker Jabberwalker:
You need a brace of Jack Russell Terriers around. They are purpose-bred to make short work of barns full of rats.
Even if that works, I'm not sure it would, you need something bigger to survive the coyotes...
I'm not doubting the tenacity of the little terriers, my wife had a terrier mix and that little shit would tackle anything.
But I can see a shorter dog getting over run by the rat swarm in a situation where you are uncovering a large nest.