i've never heard of it being "poison". i think the groomer was way out of hand.

i also don't like the way the box says not to come in contact with it, but our dogs can. dog's have even more sensitive skin then we do. i use to use Bio-Spot on my dogs, but now i just give them garlic. i don't use flea/tick shampoo on my dogs. unless i have a rescue that needs it. i don't see i need for it if your dogs are correctly protected in some other form.