I ride a lot of rocky trails, gravel, and the road... my mare has to have shoes or else she gets very tender. My gelding doesn't get tender, but he hates walking on the larger rocks and tries to get in the grass whenever we ride. He'll willingly walk on the road, and on gravel, but the rocks give us problems every now and then.
I don't have the money to get them both shed on all four legs... but my mare doesn't have much of a problem with her rear hooves (when I started riding her, for the first year or two she only had front shoes and never had a problem) and my gelding doesn't have a problem with his rear hooves either.
I'm not sure how much my farrier charges for fronts... I think about 35 dollars, but I may be wrong.
What are the pros and cons of getting only the front hooves shod?