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Hello, I'm Dr. Kara. I have over 20 years of experience as a veterinarian and I'd like to help. Please give me a moment to review your concerns.
I'm sorry to hear that your fellow chewed on a half dollar size of tomcat mouse poison, but I am glad that he is such a big fellow and that most of it was taken from him before he swallowed.
Most rodenticide poisons are anticoagulants (warfarin, pindone, coumafuryl, coumachlor, isovaleryl indanedione, chlorophacinone, diphacinone, brodifacoum, bromadiolone, difethiolone), but some calcify tissues (cholecalciferol), some are neurotoxins that cause brain swelling (bromethalin), and others are phosphide rodenticides which produce phosphine gas in the stomach and can lead to bloating and liver and kidney failure and seizures. With phosphide rodenticides the more food in the stomach the more gas is produced, thus we don't recommend food.
Do you know which active ingredient this particular rodenticide contained?