Which term describes an abnormal arrangement of the teeth in horses?

The term that describes an abnormal arrangement of the teeth in horses is "Parrot Mouth." This condition, also known as "overshot," occurs when the upper jaw or teeth project beyond the lower jaw, leading to misalignment. This misalignment can affect a horse's ability to chew properly, which may subsequently impact its nutrition and overall health. Parrot Mouth is a hereditary condition and can vary in severity, requiring attention from equine dental professionals to ensure proper management and treatment.

The other terms mentioned in the options refer to different issues in horses. "Sweeney" describes a condition related to the atrophy of the shoulder muscles, often due to nerve damage. "Windpuffs" are soft swellings around a horse's fetlocks, generally caused by minor joint or tendon irritation. "Heaves" is a chronic respiratory condition in horses that leads to difficulty in breathing. Each of these conditions is distinct from one another, highlighting the specificity of equine terminology.