Wow you're a wizard! Thank you so much for your help. I really appreciate it as it eases my mind.
2ml is 2% of 100ml. (100ml=3.2grams.) 3.2 grams is 3,200mg. 2% of 3,200mg is 64mg. Total dose you gave him=64mg. If the toxicity level is 250mg per kilo body weight, it does sound like this is well under that.