Hi everyone, this is my first post here. About a week ago we bought two male guinea pigs, they are adults but the shop owners were unable to tell us how old they are but by looking at them I would say about a year old. They were both very scared, thin (you could feel there hip bones and spine) and one had a few bald spots. They are settling in really well, have started taking food out of our hands...are eating loads and drinking well, the one who had bald spots has hair growth, you can see the new hairs coming through but they are still skinny. They seem happy enough, active, bright eyed, as I said eating and drinking. I was just wondering how long it would be before they start putting on weight or could there be an underlying problem. Any advice would be very much appreciated. Thank you all in advance.