Since you didn't, I can't tell if there are other threads on this guinea pig that would help give a history of its health.
I am posting the pictures you sent me but they are not clear and do not seem to show what is going on. Look over the info on spurs on this page:
Lynx - I have posted many times, but looking back over I have never posted about her as far as I can tell, only the boys. Past medical history would be pneumonia (recurred twice) and an inbred pregnancy + a second inbred pregnancy that was back-to-back (which was emergency spayed in an attempt to save her life).
Do keep her nails clipped. Some guinea pig seem to have curving nails - routine clipping is mainly important to prevent twisting of the toes and eventual curvature into the foot.
- Supporter 2004-2018
(ETA-duplicating what Lynx was posting at the same time as I was.)
When she was younger (she isn't that old, almost three) she used to eat all of her hay (timothy and alfalfa when she was pregnant). About a month ago we brought a new hay into the house (an orchard/timothy blend) and she has stopped eating her hay. Both of the boys prefer it to the timothy and have gained weight, but Sunny is barely eating her hay now. I brought her into the vet about a week after it started and she nibbled on the hay there, but as soon as we came home she stopped again. I can't seem to find anything wrong with her, but I'm concerned. I'm going to bring some timothy home and see if she'll eat it (it's what the vet had) but she has been less active. She sits in her poop sometimes and her nails have poop on them. It looks like I don't clean their cages, but I do! I'm not sure what to do...