We have a milking doe with a rock hard udder. She kidded 2 months ago. She had a nice udder, would deflate very well after milking, easy to milk, overall an almost perfect udder and very suddenly turned rocky. It feels like there are three rocks in the udder, one big one and two, not-so-big ones. The milk doesn't taste any 'goaty' taste or 'salty' taste or any off taste at all. She doesn't have any bloody or grainy milk. She acts normal, she isn't sick. We are just wondering what can it be and how to treat it.