I don’t know who made that statement, but lots of horses can carry 250 poundssome can carry the 400 pounds you referenced.
But not a 900 pound conventional horse.
The “Bush Gardens” horses, more accurately called Clydesdales, cannot carry as much weight as you think.
Is there a weight limit for riding a horse?
A horse can carry between 20 and 25 percent of its own weight, including tack (saddle, etc.). An experienced, well balanced rider can usually go up to the 25% range, but all other riders are sensible to stick with the 20% limit. The average horse weighs around 1000 pounds if in good condition.
How heavy is too heavy for horseback riding?
A study published in the Journal of Veterinary Behaviour suggests that the rider should weigh less than 15 percent of their horse’s body weight. There is still some debate about this percentage, but the general rule of thumb is that a horse should carry between 15 to 20 percent of their weight.
How much weight can a Clydesdale hold?
Today, the Clydesdale stands 16 to 18 hands (64 to 72 inches, 163 to 183 cm) high and weighs 1,800 to 2,000 pounds (820 to 910 kg).
What kind of horse can carry a heavy rider?
Just about any healthy horse can carry that size person, even though a small stature horse like a Palomino, or smaller should would struggle after a short while. A recommend a Quarter Horse, Draft, or actually many will conditioned horses that ways above 1100 lbs, since a horse can carry there weight divided by 3.