Hi, I've never posted before, hope someone will have some advice. We rescued two baby brother guinea pigs for my twin daughters two and a half years ago. On Friday we noticed Tuck had a rather large lump, which seemed to have appeared from nowhere and took him to the vet. He had a big abscess under his chin, was admitted to vet hospital and kept overnight. They lanced it and said probably from a bite. We got him home the next lunchtime, they kept him longer as he didn't eat much. Went back for another check on Sunday lunchtime, the vet said not as much sound in his tummy as she would like, try to get him eating more. We gave him all his antibiotics and something to get his gut moving as directed, and liquid food. On Sunday night and all of today he was eating pretty normally again, loads of parsley, celery, some carrot, lots of hay and drinking plenty water. I'm a bit worried though, we had them out for about an hour tonight and although he peed a few times, no sign of any poo. Its impossible to tell if any of the pellets in the cage are his. Is this a bad sign or could it just take a wee while for him to get fully back to normal? Is there anything else we can do? Going back for yet another check tomorrow but grateful for any advice.