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How much does the dog weight that ate this pill. Was it just a single pill that had 65 mg of iron in it? No other supplements to it?
What specifically was the type of iron in the supplement? Was it ferrous fumerate?
Ok. Ferrous fumerate is only about 33% elemental iron. So that 65 mg tablet has about 21 mg of elemental iron in it. A 20# ***** is basically 9 kg. So that 21 / 9 gives a dose of 2.38 mg / kg. This isn't something that should cause a toxicity situation. It could cause some GI upset in some that are very sensitive. Iron if in a large enough dose initially will cause vomiting. At the dose that this one got, it shouldn't be an issue.
That is the best case scenario to find the pill! I should have thrown that out there to screen for the pill under chairs / the couch / etc... I get those cases at my ER where something is "thought" to be eaten when it really wasn't. So for future reference, one pill eaten shouldn't have been a big deal at all.