If they were really short on rations for a long time, the youngster may be stunted. Which will be okay in the long run once you get him back to proper chow. I'm wondering if I see a "wormy" potbelly on him, and if he has worms the other one would too. I'm glad you've got worming started, but remember it can take a while and different medications to get them all. The vet is going to be your friend.
The older horse definitely looks skinny enough to me that I'm sure 20 minutes of riding really did exhaust him. Get a couple hundred pounds on him, then you could start riding him on some walks. They're a great way to build up muscle and endurance, and would get you some riding & training time too. Short walks at first, 15 minutes, then 20, then half an hour at a time. Once he can walk at a good pace for half an hour without seeming tired, you can mix in some trotting. The young fellow needs to know how to stand tied, how to pick up his feet for the farrier, and how to be away from his friend without pitching a fit. All for just 5-10 minutes at a time. The rule of thumb I've heard is train for no more than 15 minutes at a time, and the number of times per week is the same as the horse's age. So since he's not yet two, twice a week would be plenty (and only once a day). He still needs to be a baby.
Thank you for rescuing this pair! I think they found their angel.
Last edited by Rule of Reason; 12-26-2011 at 08:08 AM.