My dog had been roaming the woods with us, and as an extra precaution we decided to buy the flea/bug treatment. Once the application was finished, my 95lb Pittie, (White with tan spots..he is literally this dog lol. Patch and all. 🐶) scratched himself for 10 minutes straight. Told him to stop and nothing more happened. Over 24 hours, his skin started to turn red. I thought maybe from the scratching. Then 24 hours after that, his back had huge open flesh wounds. Places that he could not reach with his paws. The picture posted is the scars he got from all the open sores/wounds.