The Light Grey Rhino is a hunter pet appearance in the Clefthoof family. There are 4 tameable creatures with this look.
Turtle - Wowpedia - Your wiki guide to the World of Warcraft
WoD Challenge Modes and Rewards, Patch 6.0.2 PTR Notes, Upgrading to WoD Collector's Edition - Wowhead News
Clefthoof - Hunter Pet - World of Warcraft
Basilisk - Wowpedia - Your wiki guide to the World of Warcraft
Stag - Wowpedia - Your wiki guide to the World of Warcraft
Silver-Grey Wolf - Pet Look Petopia - Hunter Pets in the World
Grey Mammoth w/ Large Tusks - Pet Look Petopia - Hunter Pets in the World of Warcraft
Rare pet, WoWWiki
The current state of Hunters in Battle of Dazar'alor
Light Grey Worg - Pet Look Petopia - Hunter Pets in the World of Warcraft
Fox - Wowpedia - Your wiki guide to the World of Warcraft
Loque'nahak - NPC - World of Warcraft
Green & White Dreamtalon - Pet Look