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Question
I thought about that as a factor, i can't feel any lumps though. It's just a large soft mass which feels like fat. I was hoping it wasn't a tumor. Thank you for your advice, I will prepare my family for the upcoming loss...


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Followup To
Question -
My female syrian hamster has become obese. She is about 1-1.5 years old.  I didn't think I overfed her, but it seems that I had. She was healthy and alert and playful when we got her, but now she wobbles around and you can't see her back feet. She doesn't get up to run around anymore and when we make her get up, she just finds a spot to fall asleep. She is unable to clean herself like she used to and I am very concerned. What can I do?
Answer -

    I am so sorry to tell you this but your hamster seems to have developed tumors. This is very common in older aged hamsters. All the things you described are symtoms of tumors. They weight down the hamster, which make it hard for them to clean themselves and to walk and run. Most likely your hamster is going to die, i'm sorry. My best advice would be to prepare yourself for her death, it might not be soon it might be a while, but the more prepared you are the easier it hits when it happens.  

Answer

      Sounds like this might be a fatty tumor, those are a little less deadly in hamsters, but can still cause death. This type of tumor takes awhile to grow to that point of extent though, so it sounds like you have a little more time than I previously said.

Sorry to have mis-informed you the first time