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Hi. My name is***** Thank you for taking in this girl. Maggie sounds like she's going to get the care and attention she needs. The "blood" that you saw was blood. But, it was blood that had been digested by the fleas and excreted in their stools. The "dirt" you saw most likely was a lot of flea dirt (flea poop) and when it get wet, it gets very red. Washing it all off allowed it to get rehydrated and to look rusty / blood like. At this time, getting her that bath has helped. What I'd also do for her is get her to your vet to have them start her on a topical flea product too. Her be pale could easily be a flea anemia. The fleas feeding on enough blood to take it out of her body. If the fleas are gone, then the blood loss is stopped.