this has been a very bad day today my 2 year old cat died today because I used hartz flea treatment ,I want to know how they are allowed to sell this product I am so upset ,I never seen a animal shake like that before ,my husband and I found this cat outside when he was 7 days old we bottle fed him he was my baby !! I cant stress enough to all pet owners DO NOT USE THIS PRODUCT !!!!!!!! By the time I got to the vet he was gone !!!!!