You're only supposed to use that kind of poison inside a dog and child resistant bait station that locks. That's why blocks of rodenticide has a hole in the middle, you slide it onto rods inside of the bait station so the rodents aren't just dragging it off somewhere.

There are treatment options if pumping the stomach is not an option. The vet can administer activated charcoal to help limit absorption, and vitamin k can be injected to help with clotting. In severe cases blood transfusion is an option.