Headcanons about the horses in AOT
The Eldians were historically master horse breeders. The number one reason why they were so militarily successful was obviously the Titans. But the number two reason was their horses! Their very dedicated breeding of domestic horses resulted in a breed referred to in modern-day Marley as the Eldian horse. The Paradisians have continued to be master horse breeders and have improved the Eldian horse even further.
The Eldian horse is on the smaller end of horse sizes without being a pony. They are around 160 cm tall and weigh 450-500 kg. Their color is bay the vast majority of the time, with occasional grey, black, and chestnut individuals. They completely lack any white markings. They typically have a calm temperament, and do not react to loud noises and sudden movements as much as other horse breeds. The Eldian horses of the modern day have been bred by Paradisians to be even faster than their already very fast mainland ancestors. Their speed is now faster than any other horse breed, with a maintained speed of 35 kilometers an hour, and a top speed of 75-80 kilometers an hour. But what truly sets them apart from other horse breeds is their stamina. Eldian horses can run at a gallop for a very long time compared to other breeds without needing a break. And Paradisian breeding has elevated this stamina even higher.
Currently, there are not known to be any purebred Eldian horses left outside of Paradis. After the fall of the Eldian empire, most places where Eldians, and thus Eldian horses, could be found, did everything they could to eliminate the Eldian cultural identity. And part of this involved destroying the Eldian horse breed. Usually, this was done by breeding Eldian horses into their own horse breeds to increase their speed and stamina, and avoiding breeding Eldian horses to each other. However, these mixes never produced horses that had the full speed and stamina of a purebred Eldian horse. Other times, the horses were just straight up killed. And thus, outside of Paradis, the Eldian horse ceased to be a distinct breed.
In Marley, it’s illegal to say or do anything “in support of the Eldian Empire.” So it’s very much not allowed, legally OR socially, to say that anything about the Eldian Empire was “good.” But of course, Marleyans are not a monolith. Different groups believe that the specific thing THEY’RE interested in about the Eldian Empire was actually the only good thing about it. For horse fanciers, many secretly or not-so-secretly believe that the Eldian horses shouldn’t be blamed for the crimes their human masters made them commit, and that the breed should be revived, since no other horse breed has been able to match their speed and stamina despite many attempts to do so.
Some horse fanciers have gone all over the world (at least, the places they can get to) in search of Eldian horses they can use in a breeding program to revive the breed, but with no luck. It’s well known in Marley that the Paradisians took Eldian horses with them to Paradis, and that their horses are most likely the only true Eldian horses left. There are Marleyan horse fanciers who are willing to break any laws they have to in order to get their hands on a breeding group of purebred Eldian horses. If it wasn’t for the Pure Titans roaming around on Paradis, some brave individuals would absolutely try to sneak to the Walls behind Marley’s back to steal or buy some horses from the Paradisians. And some horse fanciers in other countries feel the exact same way!
On Paradis, a horse is very expensive. Usually, only wealthy people, the military, and people who breed horses for the government are able to own horses. Horses trained for military use are even more expensive due to the training they need to go through to prepare them to stay calm and follow orders in battle.
All horses in the military have the rank of “Horse Commander,” which ranks below Commander/Commandant and Premier, but above Cadet, Private, Captain, and Section Commander. This is to make sure that the horses are treated with the respect owed to a commanding officer and to prevent them from being abused. If a horse is found to be abused or neglected, the perpetrator won’t just get punished for animal abuse/neglect- they’ll also get punished for harming a military superior.
In the Survey Corps, every Scout is assigned a specific horse to be their main horse. Scouts are expected to try to form a bond with their horse to ensure full obedience in battle. A bunch of extra horses are also kept for reserves if a Scout’s main horse is unavailable for whatever reason.
Horses used in the military are trained to always run towards any person who whistles a loud and long whistle of a specific pitch and allow the person to ride them, unless they are already being ridden. Jean’s horse during the 57th expedition, Buchwald, was also trained to do this- he’s just unusually disobedient compared to most Survey Corps horses.
In the Survey Corps, there are a lot of rituals done before an expedition that have been established over time due to superstitions regarding returning home safely. One of them involves personally giving the horse you’ve been assigned to ride a treat before you leave for the expedition.
Feral horse populations exist both inside the Walls from farm escapees and outside the Walls from survivors of Survey Corps expeditions who ended up separated from any riders who could take them back to the Walls.