My Becca was on both Phenobarbital and Frontline for several years with no problems. The Frontline continued to work fine for her. Have you tried any other flea/tick preventers? Maybe Elvis has just developed an immunity or resistance to it?
__________________ He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown |