Sometimes people are curious about "what is the most expensive horse breed"? This question is a difficult question to answer, because so much of a horse's value depends upon age and training. When talking about foal (young horse) prices- horses that have a common age and training level- (although this doesn't take into consideration bloodlines within a breed) the most expensive breed of horse is probably the Gypsy Vanner or Friesian Horse. These breeds are at a height of popularity in the U. S. currently. Ironically, horses marketed as Gypsy Vanners in the US are common grade horses in the United Kingdom. Gypsy Vanners or Friesian foals can frequently sell for anywhere from $10,000 to $25,000 even as foals. Compare to the average quarter horse foal which sells for about $1,000, or average Welsh Pony Foal which sells for about $4,000.
However these prices are a bit deceiving. Bloodlines and show potential play a huge part in horse prices, regardless of breed. For example, a well-trained Friesian saddle horse might sell for $35, 000, however a Quarter Horse Stallion who's won a World Championship might sell for $100,000, and a showjumping horse with Olympic potential might sell for $500,000 or more! If you are to include racing thoroughbreds in the calculations, then surely young horses selling for millions would take the prize! however thousands of failed thoroughbreds can be adopted for less than $1,000 so the value in a Thoroughbred is the racing potential, not the breeding itself. So as you can see talent, bloodlines, and training play a huge role in horse prices. The most expensive horse breed is probably the breeds named above, however individuals of almost any breed could sell for that much or more with the right training and talent.