I saw on tv the other night that since Dec dogs are becoming very ill some dying..from over the counter flea meds,,they said so far the ones we get at the vet are OK..but they are now going to also look into them..after that never saw anything about it again nor read anything about this!!!! I use Frontline Plus but now I am worried about using it..the ones in question are the kind you use on the neck like Frontline..not sprays or powders.