Just keep an eagle on on this little one and watch for any changes in behavior, eating habits, etc. My little one, Gina, has worms. I got her as a puppy. She is 1lb, 4oz. The doctor ran a complete set of tests on her in a professional lab. No inhouse tests. He sent her blood test out to another lab in Torrance, Ca. I give one dose in the morning, and another at night before she goes to bed. I keep her medicine refrigerated.