How can I tell when my nigerian wethers are getting fat? They are busy all day beating up on each other and jumping atound their playset so their activity level is HIGH. Their winter coats are starting to grow in and I' like to make sure they aren't getting too fat or too thin. I know that with Pygmies, you feel along their spine, but they are much more barrel-shaped then my nigerians. They all weigh in around the 40-50lb mark, I think. Have to check my records.