Unfortunately Patrannache can be quite difficult to track down. I definitely found him to be the toughest of these new hunter pets to find without a doubt. He has an incredibly long and windy patrol route through a very good portion of The Valley of the Four Winds. (See map below for exact path.) Luckily he can be tamed by hunters in any spec, and once found he makes a unique pet that really stands out.
How to track: Like the other trackable hunter pets, you will not be able to see him when he's up. He is completely stealthed. In order to locate him, you will need to find and follow his tracks - tracks that thankfully only hunters can see. Once you've found his tracks you'll need to follow them until you don't see any more. This is where I like to wait and watch where I think that he'll be walking next. Often times you'll see a new track appear right in front of you - this means you've found him!
Once you find him, the only way to see where he is, will be for him to walk through a flare. Don't throw your flare down on top of the track he just left, throw it a little further out in front of where you think he is. When he walks through your flare he will become visible. You can take this opportunity to tame, or you can throw a Hunter's Mark on him - which will keep him visible to you when he goes back into stealth. Hunter's Mark will make him visible to you, but only you when he's in stealth.
Patrannache's tracks are called "Barely-Visible Tracks", and they are very aptly named. Patrannache's tracks are incredibly difficult to see. They are very small, and blend right into the ground for most of his path. If you want any hope at all of finding these tracks it is an absolute necessity to turn ground clutter down to a minimum. I also found it helpful to hover my mouse over different anomalies in the terrain that I was scouring over so that the name of his tracks would pop up if I'd come across one. Like other beasts' tracks they do not stay up indefinitely; the furthest ones behind disappear one by one as new tracks are created. The best advice I think I can give when looking for his tracks is to take it slow, and check each area thoroughly. It is very easy to scan the terrain with your eyes and miss his tracks entirely - which may actually be right in front of you.
(His tracks are now facing the correct direction as of patch 5.2. You no longer need to follow them backwards.)
Patrannache's Path is hands down the longest and windiest of all the trackable hunter pets introduced in MoP. His path starts in the far east next to a tree by a small hill covered in grass and bushes. From there he heads west and literally winds his way through most of the zone. He walks through highly traveled quest areas, open empty fields, swims across water, he really does just walk all over the place. His path ends roughly in the middle of the zone, south of The Heartland just before the roads intersect. It takes him about 1 hour and 38 minutes to move from one end of the path to the other. When he reaches the end of his path, he simply turns around 180 degrees and heads back in the direction he came from.
|Click map to Enlarge|
|The above screenshots illustrate the eastern end of Patrannache's path. You can see him heading toward it, and then turning around.|
|Above from left to right: Patrannache is heading west along the Yan-Zhe River, then turning north past Galleon on the Rumbling Terrace and heading across the river.|
|Above from left to right: Patrannache is heading northwest past Mudmug's Place (quest hub), then entering the Gilded Fan moving north and finally moving southwest through the Verdant Belt (Halfhill in the background).|
|Above from left to right: Patrannache is heading east over The Gilding Stream moving toward the Silken Fields, passing the Silken Fields, then moving south through The Plain of Theives and about to cross the Yan-Zhe River.|
|Above from left to right: Patrannache is walking west through Wind's Edge (Stormstout Brewery in the background), then passing bravely under the elite quest mob Darkhide on The Wild Plains, and finally continuing northwest through The Wild Plains.|
|Above from left to right: Patrannache is heading north past Stoneplow (the only area where I encountered any phasing issues with him), then through the hills bordering the Singing Marshes, and finally heading through the Singing Marshes.|
|In the above screenshots you can see the opposite end of Patrannache's path, just south of the Heartland and west of Halfhill.|