I am not sure which is more fun to have around. What would you rather step in out in your yard- a hole or a doo?

I put it in the holes when planting bulbs and it helps keep critters from digging them up. Our pocket gophers make long tunnels and I do not have enough dog doo to fill them. We just flood or trap.

Fireraven9
Gutta cavat lapidem (Dripping water hollows out a stone) - Ovid

This works for moles. They dig away from the poo so you continue until they go else where.
As far as rats and dog poop. They eat dog poop. So putting it down their hole wouldn't be the best idea if you want to get rid of them.

I know I stay as far away from dog poop as possible. So the theory may have some validity. But this is the twenty first century for Pete's sake!! You can probably "do" a little better than that for advice! LOL Rat's are gross and unsanitary. Maybe they should try a good old fashioned exterminator.