[Avista]

You have to do what you feel is best. My little ones are 10 lb and 15 lb. This is what my vet perscribed. I just get it online. If it weren't the correct medication, we would have seen a flea by now.--Haven't seen one. I have the blood check done for heart worms each year. These tests have always been neg. The vets probably get their medication online and sell to us. What I get is Pfizer packaged. That being said, we all must take care of our "babies". Barb