I've never had an issue with tumors in my rat colony and I'm wondering how common they are. I'm not talking about megacolon, I'm talking about old age tumors. My sister's hairless kept getting tumors that would grow, then 'pop', then grow back. The poor thing had a gigantic tumor when she was 3+ years old that wouldn't go away and they put her to sleep when it got really bad.
Is it a hairless rat thing or does it happen with a lot of rats?
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