Hi I'm new to the forum and quite new to owning guinea pigs as we got them for my daughters 6th birthday in June. Tinkerbell and Fawn are firm members of the family already. The problem is this: our piggies are indoor pigs but we have a big run in the garden which we use in the good weather. On Fri they spent most the day out there and when we went to get them in we noticed Fawn was not putting any weight on her back leg and on Sat morning we inspected her again and saw her knee joint was swollen, so my husband took her to the local vet (we hadn't needed one yet so our 1st visit) and he said she has an infection. He then said he would stick a needle in and draw out some fluid, when he tried this he couldn't get any and said the infection might be solid. Anyway he gave her anti biotics and we've got a couple of doses to give her at home. So basically, I'm wondering if A) it had anything to do with being outside? Don't know what, maybe stung by a wasp? It have been older and we only noticed then. B) if the vet knew what he was talking about (my husband seemed a little doubtful and he was a part time every other Sat vet) and C) if anyone else's piggie has had this and were they ok? She still seems quite happy, she's eating and I have put her in the run again while they still can but I can't help worrying. They are fragile little things! I'd really appreciate any advice, thanks x :{