Domestic Dog

  or other non-








Species or F1 or

   F2 Hybrid






 Species or F2


* Licence Required





A brief history of Wolfdog Hybrids in the UK

The “F” filial number refers to the number of generations that a wolfdog is removed from a pure wolf.


For example:


F1 wolfdog has one parent who is a pure wolf. The other parent can be a wolfdog or a dog.


F2 refers to an animal that has at least one grandparent who is a pure wolf.


F3 wolfdog is one that has at least one great grandparent who is a pure wolf; so this animal Would be three generations removed from a wolf (pet status).

In 1993, the domestic dog (Canis lupus familiaris) was reclassified under the species status of the grey wolf (Canis lupus) in Mammal Species of the World: A Taxonomic & Geographic Reference, the internationally recognized taxonomical publication, printed by the Smithsonian Institute and the American Society of Mammalogists.


So the timber wolf (Canis lupus nubilus), the arctic wolf (Canis lupus arctos), and the dog (Canis lupus familiaris) are all subspecies under the genetic umbrella of the grey wolf. Some scientists believe that the dog should, more specifically, be referred to as a domestic variant of the grey wolf (still under the species designation of Canis lupus) rather than as a subspecies of grey wolf (i.e., equal to the arctic wolf) because of its domestic status.



On the 1st October 2007 the Department for Environment, Food and Rural Affairs {Defra} amended the Dangerous Wild Animals Act 1976 Wolf-dog hybrids with the exception of the Wolf (Canis lupus) and the first two F1,F2 generations of hybridisation, an F3 wolfdog hybrid domestic dog (canis familiaris) is classified as domestic status which requires no licence.



Wolf-dog hybrids are not a true species but a hybrid of the domestic dog crossed with the wolf. These animals are required to be licensed under the Act.  This is because the Schedule to the Act states any hybrid of a kind of mammal specified in the Schedule must be licensed; a wolf is a mammal specified in the Schedule as it is included in the listing of all species of Canidae (i.e. the dog family) and does not fall within the specified exemptions to this listing, unlike the Canis familiaris, the domestic dog (but not the Dingo, Canis familiaris dingo), raccoon dogs and foxes.



In addition, under the Act any animal with at least one parent as such a hybrid requires a licence. However, the second generation following a wolf/domestic dog hybrid does not require a licence if neither of its parents is a hybrid, as illustrated .


Therefore, taking the third Generation “F3” or Czechoslovakian Wolfdog and the Saarloos wolfdog are both now no longer classified as 'Dangerous Wild Animals', which are as of yet not recognised by the UK kennel Club.


Wolf-dog hybrids are not a true species but rather a hybrid of the domestic dog crossed with the wolf though a licence is not required under the Act we must also consider that this will not give a true Pedigree status or acceptance for breed clubs.