Issue by The Black Stallion: How prolonged does hair loss from demodectic mange goes back again? My 5-thirty day period-aged French Bulldog was diagnosed with demodectic mange. He had experienced gentle hair reduction on the confront (and the pores and skin grew to become reddish). He is now on medication for 3 times. How long will it acquire for the hair to increase again? Greatest answer: Response by Ernie’s Li’l SisBased on how extreme the circumstance is, it can take a number of months, sometimes even months. Dependent on how quickly his immune program is too, and how fast and fast the skin heals. Know far better? Leave your personal answer in the comments!