I am going to make the assumption that this is your first horse and you are still learning the ins and outs of horse ownership. Most horses do well on a 4-6 week trim cycle (depending on if their barefoot or not). I think most shod horses do around every 7 weeks, but I'm not sure on that one as my horse is barefoot.
A horse's hooves are very important, and should be very high up on the priority list. Proper trimming, along with a good, well balanced diet is essential to keeping the hooves healthy.
I would get in touch will a well known, good farrier and get him on a regular trim cycle, the hooves will not get better overnight, but you should expect to at least see a major improvement after the first few trims. Also check your diet to make sure the hooves are getting the correct nutrients to grow healthy. There are tons of great websites on the net about horse nutrition, and I suggest you take a look at them (thats what I did, and there was a TON of great information that helped me properly balance my horses diet).
You will notice that most people on here are very passionate about proper health care, and it may come off to seem rude. I assure you though that everyone here has the best interest of your horse at heart. You can learn a lot from this forum. While most people on here are well versed in horse knowledge, we sometimes get so passionate that we forget the fact that not everyone knows the ins and outs of proper horse care.
I commend you for coming here to ask advice. Your horse will feel much better once those hooves get taken care off :).
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