Jodie....That is what Sahara is on to keep her mange at bay. You are going to have to find a "liberal" vet who will not mind supplying a cow heart-worm killer! That is the treatment we wanted for my girl all along, but it was tough to find someone to write the prescrip. Call some local vets and explain the situation. Someone may be willing to take a look and prescibe some (if that is the recommended remody). Isn't Ivermectin strong for a rattie?!?!? We had to be super careful for a 100 pound dog....??