Thanks for all of your concerns about Mattie. FOrtunately, she only had to stay at the vet's for one night. They didn't know what was wrong, but all the blood test showed was that her Iron was low. We were wondering if she ate some sick bird or mouse. They had to shave her paw a little bit in order to put the I.V in, but the patch has almost grown back. So, thay gave us some gastro intestinal food for her to eat for a couple weeks. By the way, Mattie is a Golden Retriever puppy, who's about a year and a half. She's really sweet and I love her so much. Thank's for caring about her!!