P. t.1061 preserved at the Manuscripts Department of the Bibiothèque Nationle de France, is a Dunhuang Tibetan veterinary medical manuscript that focuses on the surgical therapy of equine rhinopathy. The method of blowing a small quantity of ammonium chloride through a bamboo tube to treat horse nasal sinus diseases was described in the original scroll; if not effective, burn with a proper cauterization apparatus; if still ineffective, prick with a fine bloodletting needle; if still not effective, operate frontal trephination. The frontal trephination documented in P. t.1061 is by far the earliest record in Tibetan language of relative operation so far discovered.