Why is my old hamster breathing fast, inactive, and lifting bum?

I can see that your hamster is hunched and her fur is raised. Her labored breathing is cause for concern. It can be caused by infections or masses, and requires veterinary attention right away. The blood you identified can be caused by bloody stool, or even a rectal prolapse, both of which are serious medical conditions. She should be seen by a vet as soon as possible, as she may require supportive care to be stabilized. I hope all is well!

Thanks for reaching out about Vasia and including photos. It is impossible for us to determine how long he will remain with you but if having breathing difficulties, a veterinary visit could prolong his quality of life. Respiratory infections or heart disease are possible manageable conditions. Good luck.

Two years old is considered "old age" for a hamster. These may be age related changes, but you would need to have him physically examined by your veterinarian to diagnose and treat any infection or injury. The clicking while breathing is concerning as it could be a respiratory infection.

Chewie sounds very sick, and I am so sorry that this is happening. From what you are describing, she needs to see a veterinarian immediately. She can then be evaluated to see if there are any possible treatments for her, and if there are not, they can assist with euthanasia if that is needed or desired by you to ease her suffering. 18 months is an older age for a hamster, so that may be related to why she is getting sick. The material around her nose may be making it hard for her to breathe as well - if she tolerates it, you can clean the material off with a warm, wet cloth, but be careful so that she doesn't panic or struggle when you do it since she is already having a hard time breathing. The veterinarian can also clean this off for you as well. I am so sorry again - it is never easy to have a pet get sick.

IF she is breathing fast that is pretty much the opposite of what is supposed to happen at hibernation, which means she is probably very ill rather than hibernating, you need to take her to the vet ASAP.

Dexter needs to see a veterinarian for an examination. The symptoms you described point to a respiratory infection which can be fatal if left untreated. This is not something you can treat at home as she will need antibiotics. ( https://pethelpful.com/rodents/upper-respiratory-illness-hamsters )

This sounds like Trico is pretty ill and should be seen by your vet or at an ER clinic ASAP. Moving her to a travel carrier or shoebox with ventilation that is warm, dark and quiet can help keep her calm and get her transported to the vet immediately for care.