A little education about chewing lice

This is my first winter with the "Girls of Chilly Water Farm" so every experience is new to me. I thought long and hard about posting this topic because when I first discovered it, I was very embarrassed. After searching the internet, talking with the Vet and our county extension agent I have learned my girls are NOT alone when it comes to chewing lice. Just the thought makes my skin crawl but apparently in the colder months it is very common in donkeys. So that being said here's how I discovered the nasty little creatures.  For about two weeks I noticed that Bridget's face was looking a little strange, strange as in her hair was shorter in different areas all over her face. I thought because we are having such a mild winter that she was just starting to shed her heavy winter coat. Then her hind end began looking the same way and Sapphire was starting to have the same patterns  in her hair.  Got the Vet right on over here and she confirmed what my daughter had told me and what the internet had suggested.  Chewing Lice! Oh my gosh, just the thought of lice on the girls was just about too much. Did not buy just one bottle of spray, no way, I came back home with four bottles and all out war has been declared. Using the spray bottle did not work with them because they were so scared by the sound so I had to start spraying a brush and applying that way. At least they calmed down and stopped kicking and running, it did look like the rodeo for a few minutes.  Spraying once a day for one week and then twice a week for three weeks, seems a little excessive but that is what the Vet prescribed not sure if it was for them or for my peace of mind. But the battle is on. Oh by the way you don't spray the girls I had to spray inside both the shelters, all the brushes,lead lines and halters..everything they may have had contact with. I am learning with animals there is always something  going on and something new to learn each new day. This to will pass and The Girls of Chilly Water Farm will return to their happy carefree ways of bringing me nothing but sheer peace and joy.