My guinea pig sometimes sounds a bit congested when she breathes. It usually goes away after a while though. About two weeks ago we brought her to the vet to see what was going on, and though they thought she looked fine, they prescribed her baytril just to be safe. She took the medication fine and was breathing normally until she finished the prescription on Monday. Now she's been sounding congested since this morning. Should I take her back to the vet to get another prescription, or do you think she's okay and it will just pass?