Guinea pigs.

Can they get colds? Ours has sneezed a couple times and has a slight gunky eye :/

I think they can but it can also be a symptom of chest/upper respiratory infection so may be worth a vet trip. Are u keeping them on sawdust/wood shavings? as switching to a paper based bedding may help as dust commonly irritates the airways.

We have a piggie with the same symptoms...he's going to the vets this week just to check him over!

From Guinea Lynx website
http://www.guinealynx.info/emergency.html#uri


URI
Labored breathing, crackling sound from the lungs, eyes that are almost sealed shut, discharge from the eyes and/or the nose, sneezing, coughing, and wheezing can all be symptomatic of an upper respiratory infection (URI). A vet will prescribe a safe antibiotic to treat these bacterial infections (guinea pigs do not get cold viruses). See a vet immediately if you see any of these signs. Untreated URIs are almost always fatal. Occasionally allergies can produce the same signs - but because URIs are so deadly and fast moving, it is imperative that the vet rules out a URI before considering the possibility of an allergy.