Flea and tick drops gave my mini dachshund a huge lesion on her back

I once purchased the flea and tick drops when I was out of Advantage. I put the flea and tick drops on my mini dachshund’s back and a few days later she had developed a huge lump on her back where I had put it. I brought her to the vet, thinking that this was a serious emergency, and they warned me never to use the Hartz product again. After a few months the lump went down, but I can’t imagine what type of unsafe chemicals could be in this product to cause such an inflammation.

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