I posted a message last summer about my mare who returned from stud with a partially paralysed face - no explanations given but as her normally kind and gentle manner had been replaced by aggression, I was in no doubt that she had been severely traumatised. Although my vet was telling me that if the damage hadnt repaired withint 6 months it would be permanent, I researched on the internet, put her on high dose Vitamin E for one month and spent the summer (4 months in total) giving her a 10 minute facial massage, acupressure treatments. Now, a year on, her face is back to normal, she had regained the use of her lower lip and her gentle manner has returned. Last month she gave birth to a lovely filly foal. Her condition had slowly improved over the winter months without any extra help from me. So for anyone experiencing this problem with their horse, I say be patient, and it will probably come right in the end, but help it by massaging key facial muscles, which you an easily find on the internet.