Guinea Lynx :: URI Crusty eyes can be a sign of a URI, which are deadly if not treated quickly. Sadly, many pet store pigs do have a URI.
Guinea Lynx :: Antibiotics You also may want to look at safe guinea pig medications on Guinea Lynx, and print of a list to take it to the vet. Many vets are not knowlegeable about cavies, so you have to be careful about a medication they may prescribe.
Edit- I must have replied at the same time as Ziggy&Herald. Sorry.