I gave my two Jack Russells Frontline+. One of them had problems walking and had green gunk comming out of her eye..she was not the same. I took her to the VET she was unconscious and her body temp was down 10 degrees. She spent three days there on and IV. She got a little better. But when she came home, would not eat and stopped drinking and had the same problems. She died 3 days later. She was 9, and weighed 9 lbs. My other dog is fine and weighs maybe 15 lbs... I feel bad. last year I let them chew and heard nothing but greif from my friends. But they were alive.