I have a hen who has been very sick for 3 months.I don't know if this is why she got sick but she had lice. I treated her and the others a while back and have been spraying poultry protector on them about 2 times a week. They also have DE Earth. I discovered today my 2 guinea pigs have the lice now too.I was going to put invermectin on the guineas but I simply don't feel safe using that stuff so I called a vet. They said ivermectin would be fine for the guineas and my chickens except for my sick Lilybug. They said she may be to weak to handle it. Obviously the DE Earth and Poultry Protector is not doing the job because as the vet said if my guineas have the lice she probably still does too. I found Pyranha flea,tick, and lice shampoo online and am wondering if anyone knows if this would be something that can be used on a weak hen. She is only one pound and is gasping for air while lying down or being held.I have a thread called "Gasping for air only while lying down or being held" Any suggestions would be great.Thank you!