The juvenile period for a Paso Fino spans roughly from weaning at four to six months through the horse's third or fourth year, encompassing some of the most dramatic physical changes the animal will undergo. During this time, the horse transitions from a leggy, somewhat awkward weanling into a proportioned young adult approaching its mature size. Growth is not linear; Paso Finos tend to experience growth spurts interspersed with periods of consolidation, and different parts of the body mature at different rates.
The skeletal system is still developing throughout the juvenile period, and the growth plates in the long bones do not fully close until the horse is four to five years old. This has significant implications for the type and intensity of work that can be safely asked of a young Paso Fino. Excessive concussive exercise, carrying heavy loads, or repetitive training on hard surfaces can damage developing joints and growth plates, potentially causing lifelong soundness problems.
Paso Finos are a compact breed, and most individuals will reach close to their adult height by eighteen to twenty-four months, though they continue to fill out and develop muscularly well into their fourth year. Regular body condition scoring and growth monitoring help ensure the young horse is developing at a healthy rate. Both excessive thinness and excessive weight can cause problems during this critical growth phase, so nutrition and exercise must be managed carefully.
Hoof growth and development require particular attention during the juvenile period. Regular farrier visits should begin early, with the first trim typically occurring around one to two months of age and continuing every six to eight weeks thereafter. Proper hoof balance during growth helps prevent conformational issues and supports the development of the breed's naturally smooth gait mechanics.