BANGKOK: The eldest daughter of Thailand's King Maha Vajiralongkorn, Princess Bajrakitiyabha Narendira Debyavati, has been hospitalised after collapsing while out with her dog on Wednesday evening (Dec 14).

The 44-year-old had been training her dog in the northeastern province of Nakhon Ratchasima ahead of the Thailand Working Dog Championship by Royal Thai Army 2022 event.