Stock Photo: A chestnut Arabian stallion horse named Kashtin flaring or exhibiting the flehmen response in Uxbridge, Ontario, Stallions will exhibit the flehmen response contracts his nostrils and raises his upper lip with his head and neck fully extended when they sm. A chestnut Arabian stallion horse named Kashtin flaring or exhibiting the flehmen response in Uxbridge, Ontario, Stallions will exhibit the flehmen response contracts his nostrils and raises his upper lip with his head and neck fully extended