I noticed this as my lovey little buck was acting bucky. His teeth have brown stains on them...real low around the gumline and in between...of course since I saw this..they are his bottom front. Now, none of my other goats have this...Bootsie is the oldest at 7 years and hers have a light colored stain...but not like Chiefs. They all get the same to eat and it didn't go away after he had a drink so what could cause this? He is 7 1/2 months old.