I have used Vectra 3D on dogs for years, and no adverse effects. However, like any medication or treatment, different dogs will react differently to different things.
"ANY" flea medication is just that ... a medication. They shot a dye into me for a test, only 1 in 100,000 ever react.... I react...
by not being able to breath at all. They resuscitated me. I was that "1" . Same goes with any medication or treatment you use on dogs.
Know the counter measures to take at any time that you give your animal something & as it could react to any medication.
Reason of review: Good quality.
I liked: Vectra 3d.
I didn't like: Frontline.