My silkie Muffin had lice and mites. I am not sure how long he had them before I noticed. He was off balance and limping on his left leg. He is now not able to stand or walk. He can kick both legs and put weight on his left one. He won't push at all with his right one and doesn't move his toes. I have had him on vitamins for 5 days now but havn't seen any improvement. Is this just a vitamin deficiency? How long does it take to see improvement? Or is it his Mareks that he is a carrier for?