I had the same problem with Interceptor the heartworm medicine. My Lola is over 11lbs. but under 12lbs. There is a dosage for dogs between 11-25lbs. My vet and everyone here in the forum said that I should go with the dosage that starts at 11lbs. One reason was that if I went with the lower dosage and the dog gets heartworm being over 11lbs. Interceptor would not guarantee their product. |