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If ingestion of rat poison is possible, inducing emesis is important. That's done by dosing her with 3% hydrogen peroxide at a dose of 5 mL (one measuring teaspoon) per 5 lbs of body weight by means of an eydropper or small poultry baster placed between her cheek teeth and cheek. She should vomit within 15 minutes. If not, please repeat the same dose. Keep me posted, please.
She vomited a white substance?
That sounds like the peroxide bubbling up. We need to get her to vomit. Please give her another dose of the peroxide.
Thank you. Perhaps she didn't ingest anything. There's nothing that looks like rat poison which is most often green and hard to miss. There are two main types of rat poison. One causes uncontrollable bleeding in up to 4 days. The other (bromethalin) causes muscle tremors, hyperexcitation, or seizures within hours after exposure. A more insidious sign - hind limb paresis (weakness) can set in up to 5 days or more later. Keep a watch on the pup, please. I can't set a follow-up in this venue so please return to our conversation - even after rating - with an update at your convenience.
It appears that you have requested a new answer. I am a licensed veterinarian with over 30 years of experience and would be happy work with you, but I do not see any follow up or question. Is there anything in particular that you needed help with?