Hello, One of our rats, Sugar, has recently developed swollen nipples. Now, she does have a tumor, which you can see on her top left nipple. I am wondering if this is a result of the tumor or something else, because we’ve had multiple rats pass due to gigantic tumors — Shadow had 4 at once and she could no longer walk, so we put her to rest. Sweet girl. She is 3 years old (it’s crazy I know) and has just recently started to breathe a bit roughly. Here are some pictures; the tumor is visible as well: Sugar is a sweet angel and we will be removing the tumor soon, but I would like to know in advance if there is anything else we should be aware of. Thanks.