YOU ONLY LIVE ONCE...MAYBE TWICE!
it seams like a lot of effort to train arms of rats to hunt down zombies, not to mention the cost of the explosives. then there's the fact that even well trained rats might not go for the zombies. then you have a bung of mobile landmines running around. to much of a rick for to few a reward to me. he was only able to use them in that movies cause he didn't care where they went. anywhere within that enclosed area was fine.