Yes. Heart Worm preventitive is very important. Dogs do not have to be put on it before they are 5 months old. Or so I was told. If you start Tess on HW Preventative before 6 months (4-5 months old) then your vet will not have to do a HW Test (very pricey). Your vet will give you the medicine for 6 months. With Tess being so tiny, it will hardly cost anything. When Drake weight 70 lbs, it was only $30.00 for 6 months.

Well, now he gets a shot! It is go convenient and you do not have to worry about forgetting to give it once a week. And it is the same price as the pills!