Hi Debbie! Before I can give you an accurate answer, I'll need some more inforation.
Is the guinea pig on a daily vitamin C supplement?
Does he get 24 hour a day access to timothy hay?
How old is he?
Is he sneezing, have a runny nose, watery eyes, or having trouble breathing?
Does his urine and feces look normal? Any crusty dry feces, or watery feces? Any thick, mucus like urine?
I am NOT, nor do I claim to be, a Veterinarian.
Always check with your vet for any symptoms your pet exhibits.
Please press Accept if you find my answer helpful.