So what is this Hoof-Line rule and what constitutes a correctly balanced hoof?
‘David Farmilo's HOOF-LINE' rule is calibrated according to a precisely calculated reference point on the hoof, requires no calculations by the end user, and takes the guess-work out of trimming. It shows in advance how much toe or heel is to be trimmed, can be used to check the work in progress, and to double check when the hoof is finally correctly balanced, whether shod or barefoot.
When a hoof is correctly balanced, the front of the hoof wall is parallel with the pastern angle, the hoof shape is a mirror image of the coronary band, there are no flares in the hoof wall and the hoof is stress free.
To view a video of Hoof Line click on the video camera 
The David Farmilo Belief's on Hoof Care
A horse’s wellbeing starts with its hooves and you should never look at a horse without first looking at his feet. David believes that the simple basic principles of Hoof Care are vitally important and that everything we do to the hoof must be to ENHANCE the horse’s natural athletic ability, not to inhibit it.
David
encourages horse owners to start taking more of an interest in understanding the horse's hoof as an essential part of its well-being and performance.
Did you know that 90% of lameness in horses is hoof related?
Most gait problems and back strain problems stem from incorrect trimming and incorrect shoeing that should have been corrected, simply by correctly balancing the hoof.
David's concern is that the basic principles of horseshoeing are being lost, that there are too many variables in horseshoeing standards and not enough is understood about how to achieve a correctly balanced hoof.
If a horse isn't trimmed and balanced properly barefoot, then no one has any business putting shoes on it.
For futher details about David Farmilo you can visit his website.
