What Is a Sound Horse?

warning signs you may observe that tell you an educated veterinary opinion is necessary.
Head Asymmetry in the face muscles can indicate a dental issue as can signs of teeth grinding 3
Neck and back Run your hands along the horses neck and back along its spine. Check for signs of swelling or inflammation. Does the horse have a limited range of motion along its neck turning its head or raising it up or down?
Legs Run your hands down one leg and then compare it to its opposite leg. If you notice any heat or swelling those are classic signs of injury but sensitivity to your touch is also an indicator of a problem.
Hooves Look for cracks in the hoof wall. Hooves should land evenly not toe first or one side before the other. Horseshoes should also wear down evenly. Use hoof testers. Reactions in certain areas may point out problems like bruising or an abscess.
While not every cause of lameness will be hereditary or untreatable its best to know in advance before making an expensive purchase.  
Keeping Your Horse Sound
Keeping a horse sound can take a lot of work. That usually means a lot of your time and attention observing the horse and providing it ample care. There are several things to do to increase your chances of keeping your horse sound
Timely foot care You will need a regular schedule like every four to six weeks between trims or shoeing.
Constant checkup Do quick body checks of your horse daily. Catching something quickly usually can lead to a quicker recovery.
Maintain a healthy weight for your horse Do not let your horse gain excess weight. The extra weight can put undue stress on the joints.
Warm up Just like humans need to warm up before exercise or running to prevent muscle sprains or strains so do
horses.
Turn out your horse In general horses living outside in the fresh air with room to move are healthier.