Last week I bought a male rat between the age of 6-8 weeks. He was sneezing a lot when I brought him home and making a lot of noises when he breathed. Five days ago I took him to the vet. My vet gave me some baytril and told me to give 0.5mls to him for 5 days. Today was meant to be his last dose, however as there is still some left in the container I am thinking of giving him more. Today I noticed that he has what appears to be blood on his nose. Is this serious? What can I do to help him? Should I see if I can take him back to the vets? I'm really not sure what to do and don't want him to suffer more than he already is.