Carmarthenshire is deep Welsh pony and cob breeding country, and unlike the more touristy parts of Wales it is still a working county — farms here have bred Section As, Bs and cobs for generations, often alongside cattle and sheep, and selling ponies is simply part of what the farm does. That makes it a good place to buy from someone who genuinely knows the pony's breeding, but English is not always the first language on the yard, so be ready for some conversations to happen in Welsh with a friendly translation.
It is a rural county with a scattered population, so viewings can mean real distances on narrow lanes, and sat-nav does not always cope well with farm tracks — ask for a what3words location or a landmark. Ponies bred on Carmarthenshire's hill farms are usually hardy and sensibly reared outdoors, which suits a family without smart livery, but many are sold as youngsters rather than backed and schooled, so be clear about what level of pony you actually need.