Join Date: Jul 2011
Location: Bethel, Ohio USA
• Horses: 0
Photo angles make this tougher than it needs to be but my first guess is a "tongue-in-cheek" problem known as "right handed farrier's disease".
Left front... low on the inside. Right front... low on the outside. Cause... farrier is right handed. He/she applies pressure on the end of the rasp with his left hand while slightly raising the handle with his right hand then moves the rasp side to side across the hoof plane. The result is medial-lateral imbalance in the hoof, artificial limb deviation, stress on the joints and possible lameness. Long term, such practice can result in premature articular arthritis.
That's just a guess based on the photos and your description.
Get some better photos to remove some of the guesswork.
Step back about 3 feet from the front of the horse and take a photo showing the legs from the knees to the ground. Hold the camera level relative to the ground.
Gently hold each front leg about midway between the fetlock and the knee with the leg held parallel to the ground. Have someone else take a photo of the foot with the camera pointed down and straight across the sole plane. The camera should be looking across the heel bulbs to the toe of the foot and the ground. One photo for each front foot.
Post those photos and we'll talk more.