|Dishu, with Druid in Travel From in the Background|
She shares the same model and color as the druid travel form, which make her a fun tame tame for low level hunters. The only other tamable cats in game that share this model and skin are the Ridge Stalkers and Huntresses found in the Badlands, and they range from level 44-46.
Dishu can be found with NPCScan. You will need to add it, her NPCScan ID is 5865.
You can also use this macro to help find and tame her:
/cast Tame Beast
Before the Cataclysm her spawn timer was somewhere in the range of 1.5 - 2.5 hrs. I am sure though that since Cataclysm it has been significantly reduced.
Although there are many rares in Northern Barrens (I will not cover all of them), three of them are tamable by hunters. Those three are: