Hi!
How long have you had your piggies for? Are they indoors or outdoors?
New guinea pigs: Sexing, vet checks&customer rights, URI, ringworm and parasites
Have you checked for potential irritants in your home?
Irritants to Avoid Around Guinea Pigs
URI is a continuous sneeze every few minutes on end for hours on end; you should also see a fairly quick deterioration with raspy or crackly breathing, eyes and nose caked with green/yellow gunk, loss of appetite etc.
Guinea pigs often sneeze when they piggy clean (about 5 times a day) and they cough if they have eaten to greedily during or after a meal (check when you hear them coughing).
We do recommend to have new guinea pigs registered and vet checked, especially if you have concerns as we can only advise and support you, but are not able or qualified to replace a hands-on vet visit. If you worry, it is worth speaking to the clinic and see whether they want to see your piggy or not.
As to the companions, if they are from the same place, then they have had the same exposure. it depends on how strong their immune system is. Bacterial URI is typically an illnesses that hits piggies with a lowered or weak immune system, especially when it is combined with stress - young pet shop piggies are the most commonly affected, plus the old/frail, bereaved or pregnant in less than ideal conditions.
PS: How many and what gender are yours?
