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What kind of poison?
Do you still have the box?
I need to know the active ingredient to give you advice on how to proceed.
Most of them are anti-coagulants. This means that they cause bleeding. The nice thing, is that it takes 2-5 days to cause any bleeding, so you have a chance to start treating. The other common type is a neuro toxin. Those take effect within hours, and they're often fatal once signs occur.
Since we don't know which one, I would do the following:
1. Induce vomiting at home. You can do this by giving hydrogen peroxide orally. You can give 1 teaspoon per 5 lbs body weight. This should induce vomiting within 10-15 minutes.
2. Go to a 24 hour vet. This is to give activated charcoal to bind whatever is left in the stomach. This is what will prevent neurologic signs if it's the neuro toxin (Bromethalin)
3. Start Vitamin K therapy. This is to prevent bleeding. The vet will have this. It's typically given for 3-4 weeks.
I hope this helps, let me know if you have any other questions.
Sorry, I can't call now. I was typing up your answer when you sent that request.
Ok. In that case, just induce vomiting with Hydrogen Peroxide tonight and then see your vet for Vitamin K in the morning. If it's the anti-coagulant type (Brodifacoum), then that should be fine. If it's the neurologic type, there is some risk.
You're welcome. Let me know if you need anything else.