Polo ponies, from breed to welfare rules.

A polo "pony" is a full-sized horse. The HPA says the name comes from an old height limit that was dropped after the First World War, and both the HPA's 2026 rules and the USPA's 2024 Outdoor Rules now accept a mount of any height. What has not changed is how much the game depends on the horse.

Four things to know first

• No pony plays a whole match. Under the HPA's 2026 rules, a pony may not play more than 7.5 minutes without a 10-minute break, or more than 15 minutes in a match, so every player needs several. Those ponies are the player's string.
• Welfare rules differ by governing body. The HPA, the USPA, the Pony Club and others each set their own rules, on matters such as play limits, heat, tack and medication, and they do not all cover the same ground. We always name the body and the rulebook year.
• One breed dominates the top level. La Nacion reports that 862 of the 945 horses at the 2024 Queen's Cup in Britain were Polo Argentino, though no rule requires any breed.
• Breeding has changed. La Nacion reports that around 90 percent of recent Polo Argentino registrations involve embryo transfer, cloning or ICSI, and Reuters reported in 2025 on five gene-edited foals born in Argentina in late 2024. The HPA's 2026 rules bar ponies that have been gene-edited for competitive purposes.

Where to start

Begin with the polo pony for size, breeds, ages and the disputed history of the height limit, then the Argentine polo pony for the breed that fills high-goal fields. The welfare rules page sets out each body's rules side by side. Training a polo pony reports how schools describe the process and why estimates of the time it takes differ. The string and grooms covers how many ponies a player uses and who looks after them, and cloning and breeding reports on embryo transfer, clones and gene editing.

For family trees, the lineage chart maps links between notable polo horses, with a source for each link.

The HPA calls pony welfare its highest priority. These pages summarise rules and reporting; they are not care or veterinary advice, and the current rules of your governing body, club or tournament always govern.