It is important to keep in mind that any herb can be toxic for pets (and humans) if given in high doses. Both the doses and the parts used are essential. For instance a leaf may be toxic, whereas the root is safe if given in the right dosage. All NHV products have been specially designed by a holistic veterinarian and master herbalist with over 50 years combined of experience in plant-based remedies. Only the safe and helpful parts of each herb are being used in the formulations. Our remedies can safely be doubled or tripled because the density of the herbs are very low and bioavailable for rabbits. There is ongoing research that shows how Echinacea can actually activate the immune system in rabbits!