my puppy have diarrhea with a litte of blood. that's the only symptoms tha she have. she's eating really good.
The blood in the stool may occur due to various causes like parasites, food, hemorrhagic gastroenteritis, rectal wounds, parvovirus and even stress.
When occurred with diarrhea, it is very important to visit a vet as dehydration can become very serious very quickly.
As treatment can vary greatly depending on the cause, you should visit a vet clinic as soon as possible, for consultation and diagnostic testing.
All the best.