Amberstill Ranch is a location in Dun Morogh on the road to Loch Modan. It lies just off the road on the north side near Gol'Bolar Quarry. You can buy a Snowshoe Rabbit small pet here, as well as accept a quest,  to kill a Wendigo named Vagash. Amberstill Ranch also has a Riding trainer and mount vendor, from whom dwarves (or players of any other Alliance race who have obtained exalted Ironforge reputation) can buy a ram to ride.
Only dwarves and people with Exalted reputation with Ironforge can learn riding skill here. Legion Update: Any race of the Alliance can learn riding skill from here.