Yes, it really is necessary for them to be tested every year. The HW prevention can be deadly if it's given to an animal with heartworms so it's best to have them tested annually just to be safe.
__________________ 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 |