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I too am very grateful for your answer! Whew!!I contacted the company that makes the bait. I asked about secondary poisoning , explaining my situation and the type of pets I have. This was their response:
"Secondary poisoning with anticoagulant baits, like Tomcat, is possiblebut it is extremely unlikely primarily because of the size difference, but also especially in domestic situations because it would require far more rodents ingested than a domestic animal would reasonably eat.
Lets look at the dog first:
Lets say your dog is 65lb, this translates to approximately 10.1 oz (290g) of bait needing to be directly consumed (not secondary) for any possible effects.
A mouse may eat about 2 - 3 grams of bait in a day, and thus may have that amount in its gut. There can be some accumulation of the poison in the organs prior to death but total bait consumption rarely exceeds 5 grams.
Now, assuming that your dog, at 65 lbs., ate the entire mouse (which we know is unlikely), it would take 58 mice to reach a lowest toxicity level (290g bait needed divided by 5g per mouse). Is this possible? Yes. Is it probable? Of course not. If my dog were eating that many dead mice I would be far more concerned about disease or parasites from the mice than from the bait.
Similarly with cats; your cats would need to eat a dozen or more mice that had just eaten the bait and essentially eat the bait that is actually still in the mice to even reach a lowest level of possible toxicity.
And with chickens we are still looking at dozen or more mice needing to be consumed."
I am sooooo relieved!! And I am very thankful that the company reterned my email, very kind in deed! Thanks to everyone on BYC who talked me through this drama