Please, folks, let's not litter the backyard with sharp broken glass.

Even if the glass burried, a dog will eventually dig up the pieces and get hurt.

Then there are children who play in the same yard.

Best anti-rat tool is still the trap, spring-loaded or Hav-a-Heart type.

Bait will result in li'l dead bodies where you don't want them at all: in your car, house, garage, attic...