For this, you'll need some form of goggles that grant Far Sight (I'm not sure if there are any that don't need engineering.) For example, I used Wonderheal XT40 Shades - Thottbot: World of Warcraft.
1. Right click the goggles to activate Far Sight.
2. While still zoomed in with Far Sight, hit Alt+Z to remove the interface.
3. Press Alt+Z again to bring the interface back, and shift into any animal form (without moving in any direction).
4. You now have Far-Sight until you use the goggles again!
The buff won't stay on, but you will still be zoomed in.
This will only work once, then you have to log out and back in to do it again.
I've only tested this on the Wonderheal goggles, so it may be possible it's only them that does this.
I've searched for any thread similar to this one, and found none. But that could just be because I'm a noob at the search engine >.< so correct me if this has been posted.