Recently noticed my continental giant rabbit was losing large amounts of fur on his neck area. I initially thought it may have just been more severe maulting until it began to spread further down his back. I took him to the vets who was unsure what it was due to there being no scabbing , which would be likely if it were down to mites. As a precaution she gave me three doses to fight mites, he was given them but the hair loss continues to spread. Help?