Norma, You can tell your vet that IMRAB -3 was tested in ferrets and found by the USDA (don't know how much weight that carries in Canada) to be safe and to exceed the minimum requirements for effectiveness. If your vet is interested, s/he can read the technical paper. "Evaluation of an inactivated rabies virus vaccine in domestic ferrets"; C. E. Rupprecht, et. al; JAVMA, Vol. 196, No. 10, May 15, 1990. Dick B. [Posted in FML issue 1615]