Thank you for this wonderful video !
Comtois are labour horses basically. I found this about Comtois horses, in English :
"Comtois (draught) : a draught horse of the Franche-Comté, a mountainous region in the east of France. The breed is very ancient and could trace back to germanic horses which were imported by the Burgondes. At the beginning or the 20th century the Comtois has been crossed with the Ardennais. Comes mainly in bay or chestnut with flaxen mane and tail. Elegant action, which is seldom seen in heavy horses, energic, deft and sure-footed horse. Its breeding has been developped in all the mountainous regions of France (Pyrénées, Alpes and Massif Central) for meat consumption. Could be now the most numerous draft breed in France, before the Breton."
Source : Lexique du cheval! Dictionnaire des races - T
And thank you for my english !