There are two types of poisons. One type is an anticoagulant and causes your dog to start bleeding from different areas such as nose, rectum, penis, etc. The other type causes an increase in thirst, frequent urination, vomiting, weakness, muscle twitching, seizures and eventually death. Symptoms do not appear immediately but from 18 hours to several days later. If it is an anticoagulant, your vet may prescribe vitamin K to help offset the action of the rodentcide.
You will need to get your dog to vomit if it has been within 4 hours and then get your dog to the vet immediately. If you can not get your dog to vomit, go immediately to the vet. Since it has been 5 hours, use this information if it should happen again.
You can induce vomiting with hydrogen peroxide 3%. Instructions on dosage can be found here:
If you do not know of an emergency vet, you may be able to find one on this site.
More information can be found here
I hope this information is helpful to you. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have . If you do find this helpful, please take this opportunity to rate my answer positively so I am compensated for my time.