"Dolichohippus" is a scientific term used to describe a horse breed with a long and slender build. However, if you're not a horse enthusiast, this word might not be familiar to you. Fortunately, there are other words that you can use as synonyms when describing this horse type. You can refer to them as slender or lithe horses, or use words like lanky, lean, or elongated horse breeds. Other accurate terms could be willowy, svelte, and stream-lined to describe their physical appearance. All these terms can be used interchangeably to describe a horse breed with a long and slender body, rather than using the less familiar word "dolichohippus".