Sonny is looking much better now. I agree that he needs more muscle tone and to gain a little more weight too. A product that I use for Brickens to help him gain and keep weight on is cocosoya oil. It works wonders and if you keep having problems with him keeping weight on I highly recommend it.
I don't know if it's him just having trouble keeping weight on or if he just wasn't getting enough as he needed. I'll see how it goes with still riding him the normal ammount...if he still looses the weight I'll try that or the "weight gain" supplement