Although not officially recognized by the AKC or other kennel clubs in the US, there are two variants based on the coat length in particular spots on the head and body and muzzle and skull proportion. The tiger Tibetan Mastiff, also known as the Tiger Head Tibetan Mastiff, has no mane on the neck and visibly shorter hair on the ears and head. The lion Tibetan Mastiff or Lion Head has a rich mane with hairs on the head and ears that is two or more inches long. With a slightly larger skull and shorter muzzle, the Tiger Head has a more robust appearance than the Lion Head. In terms of other physical features, both are identical. A thing of note is that Tiger Heads are most commonly seen with a full black, brown, or reddish coat.