shampoo poisoned a friendly stray dog

I used Hartz ultra guard flea and tick shampoo with oatmeal on a friendly stray that was stinky. After using shampoo he started licking himself. The next day he became lethargic and would not eat. I was hoping that it would pass in a few days but he has not come back since, which was not normal. I feel that he has passed on.
I did not think that a product i bought at Walmart would be that dangerous

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