hi all i am new t hunting life but to kick things off over the summer i have lost two of my best woring jills they started lossing there hair and then all of there wight and then died , i now have another jill that is lossing here hair but at the min she is keeping her wight on i have not chaned there food or the type of beding that i am using does ne one think they may no what has made my ferrets go like this