If it has bad teeth, we can help correct the problem by calling in a dental specialist. If, however, the horse was born with improper leg conformation, there really is nothing we can do about it by the time the horse is an adult. Corrective shoeing might help somewhat, and corrective devices can be effective in straightening crooked legs in a foal, but that is about it. Despite taking these steps, nothing will have changed the fact that the horse was born with improper leg conformation and continued soundness is at risk. There are, of course, exceptions to every rule.
Some horses perform well with conformation faults.
I remember a three-gaited National Show Horse which won national championships even though he had a serious conformational fault in one leg. I have mentioned in the past that one of my very best trail horses traveled up and down mountains for years and never took a lame step, even though one of his front legs was cocked at an angle. There also have been racehorses which have beaten the odds and won stakes money despite being born with poor leg conformation. However, for every exception to the rule there will be a thousand others with similar problems which were unable to perform. If one is in the market for a horse, it is far better to start with good leg conformation rather than hope you might have bought an exception.