I went to play with my rats today and noticed a large amount of blood in my baby girl's cage. She lives alone, separate from my other 3 rats because one of them doesn't get along with her so she couldn't have fought with anyone. I found absolutely no injuries to her body anywhere and this has happened sometime in less than the last 24 hours. It has to be coming from an orifice but I don't know what one or why. It was quite a bit of blood for a little rat. I'm extremely worried about it. I am going to call the vet tomorrow but I'd like to know what they might be able to do for me since there's no physical cause that can be seen? I can't afford to take her there for them to send me away cuz they don't see anything. Would they be able to do tests to figure out where it came from? If so would the tests be expensive? Also, does anyone have an idea of what might be wrong with her? I am wondering if it could be uti and the blood is in her pee? I am also going to palpate her for a possible tumor but I can't think of what else it could be and I'm really nervous. She's only 4 months old so she shouldn't have any bad health issues yet and I wouldn't want to lose her this young. Any thoughts would be helpful!