Timothy hay is extremely important to the guinea pig digestive track, so he has unlimited amounts of that, plus quality pellets by Oxbow. I do give him 1/4 tablet of a childrens chewable vitamin C tablet, which the boys are so excited for each day. I've also started giving them a tablet of Oxbow Immune Support each day. I don't know if it will help, but due to Chance's history with illness when I brought him home and now Chewy's impaction, it won't hurt. Chewy's been getting extra carrots and bell peppers, his favorites, while he's on the mend to get his weight up. In 5 days we've gotten his weight up to 1075grams which is excellent!
Not only is he eating well, but he's looking bright and alert. He's back to squealing for goodies and popcorning all over. I've never been so excited to see nicely formed fresh poop all over his cage!
Thanks to everyone for the thoughts and prayers. Chewy is officially back to himself. I will regularly keep an eye on all the boys for impacting in the future, as this can happen more with boars as they age. Hopefully this isn't something we have to deal with again in the future, but if we do, we're prepared.