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Hi. My name is***** you for your question. This is one of those scenarios where there are numerous "x" factors. How many pills do you think were in the bottle as a max? Do any of the dogs have any health issues or are on any medications?
Armour thyroid can be confusing because it is expressed in total mg of bovine thyroid rather than mcg of levothyroxine. As a good estimate, 1 grain of armour is equal to about 100 mcg of levothyroxine. 64 mg is one grain, so 30 mg is 1/2 grain. So each tablet has around 50 mcg of levothyroxine in it. Overall, Dogs have a very good resistance to thyroid overdoses. However, with thyroid meds, anything over 0.2 mg/kg of T4 can cause mild signs but greater than 1 mg/kg can cause more significant signs like tachycardia and agitation. If the smallest dog ate all 24 tabs, that dose would be around 0.17 mg / kg. This is below the 0.2 mg / kg and there wouldn't be any expected signs. So if they shared, or the big dog ate all, then the situation is even lower.
50 mcg is equal to 0.05 mg (the metric system allows for these conversions). A 15 pound dog is approximately 6.8 kg. So you take 0.05 mg x 24 tablets to get 1.2 mg and then divide this by 6.8 to get the 0.17 mg / kg dose.