Ashtail is a level 16 non-aggressive rare fox that can be found south of Mo'Grosh Stronghold and among the Hill Foxes in Loch Modan . He is especially desirable as a hunter pet as he has a unique bluish-grey skin.
Ashtail always spawns in the same location and that is approximately 75.2, 43.6. If you don't use coordinates I have marked it on the map below with a red dot. I also have his patrol area colored in yellow.
Ashtail can be found with NPCScan. You will need to add it, his NPCScan ID is 45380.
You can also use this macro to help find and tame this guy:
/cast Tame Beast
Although Ashtail is rare, he is on a pretty short spawn timer. He can spawn anywhere from 30min to about 2hours since he was last tamed or killed.
Once tamed, he has a couple of special abilities. They are Tailspin which reduces enemy attack speed and Play which makes him dance around in a fashion similar to the shaman ghost wolf dance.