I used the hartz flea and tic drops on my 8 year old dalmation mix. Within 5 hours she was having horrible seizures. Her mouth was wide open, front and back paws flailing, foaming at the mouth, and urinating. This went on for about 2 minutes and then she had another one following the first one. This dog has never had any illness. After I researched and found this website, I washed her thoroughly and she seems to have recovered. This stuff is poison. There is no warning on the hartz ultra guard packaging about this type of reaction. We need to stop the sale of this poison!!!!